When a hotel booking comes with extras, a customer would usually expect a glass of Champagne at check-in or maybe a fruit basket in the bedroom.
But for the following properties, their extras are more along the lines of hidden Masonic temples, ancient dungeons or underground grottos.
Others are rich in history from the visitors they hosted, including a British hotel that has a guestbook signed by a king and another establishment that looked after Agatha Christie while she wrote one of her most famous books.
For travellers who like a bit of mystery on their holidays, the following establishments are perfect places to spice up a vacation.
The Andaz Liverpool Street, London
The Andaz Liverpool Street hotel in London first opened as The Great Eastern in 1884
A refurb in 2000 revealed a Greek Masonic Temple hidden behind a fake wall
The Andaz Liverpool Street hotel in London is built on the site of England’s first hospital for the mentally ill - the Bethlehem Royal Hospital, which opened in 1247 and was often pronounced as ‘bedlam’.
Fast forward a few centuries and in its place is a boutique hotel with 267 rooms that hosts the likes of Beyonce and Lady Gaga.
The hotel opened as The Great Eastern in 1884 and was given a Terence ‘Habitat’ Conran makeover in 2000 after it had fallen into disrepair.
The refurb revealed a Greek Masonic Temple hidden behind a fake wall, which is considered one of the grandest Masonic temples of its time.
Masons began using it again for meetings when it was uncovered and while it’s not open to guests, this ornate room can be hired by the public for events like wedding receptions.
The Corinthia Hotel, London
Hôtel Métropole opened in 1885 and operated until until 1936, when it was taken over by the Ministry of Defence and used as the headquarters for MI9 during WW2. It reopened as The Corinthia Hotel in 2011
The Corinthia Hotel, London, opened in 1885 as the Hôtel Métropole until 1936 when it was taken over by the Ministry of Defence, later reopening as a Corinthia Hotel in 2011.
During the war, the building was used as the headquarters for MI9, a significant government organisation which coordinated and executed a large number of prisoner of war escapes across Europe. It is also believed that room 801 in the building held the government’s records of UFO sightings
Churchill wrote of hearing Big Ben strike on Armistice Day, as he watched from a window as hundreds of Londoners poured onto the streets in celebration.
The Best Western Walworth Castle, near Darlington
The Best Western Walworth Castle Hotel still has its original dungeons, and they are occasionally used
The Grade 1 listed Best Western Walworth Castle Hotel, near Darlington, dates back to the 12th Century and is set within 12 acres of lawns and woodlands.
The estate became a prisoner-of-war camp during World War Two and was then turned into a girls’ boarding school.
Most guests don’t realise that Walworth Castle still has its original dungeons underneath it, which are sometimes used for functions.
Sofitel Legend Metropole Hanoi, Vietnam
In French colonial style, the Sofitel Legend Metropole Hanoi is a five-star hotel in the north of Vietnam
In 2011, staff at the Sofitel Legend Metropole Hanoi discovered an air raid shelter hidden in the hotel
Sofitel Legend Metropole Hanoi is a five-star hotel in the north of Vietnam in the French colonial style that opened in 1901.
In 2011, staff discovered an air raid shelter hidden in the hotel which has since been cleaned out and made safe for exploration.
Almost identical to how it was found, guests can still see evidence of those who found shelter within it, such as the ‘tag’ from Australian Second Secretary and Consul Bob Devereaux in 1975.
Historian Andreas Augustin has helped train six volunteers from Hanoi to lead guests of the hotel on a daily Path of History tour that ends with an exploration of the shelter.
Kulm Hotel, St Moritz, Switzerland
The Kulm Hotel in St Moritz in 1864, left, and a picture of the hotel and surrounding mountains in 2015, right
The Kulm Hotel in St Moritz holds an interesting claim to fame - the Alpine winter holiday grew from a wager made by the hotelier Johannes Badrutt, then owner of the hotel in the mid-19th Century.
Badrutt made a bold bet to his last departing summer guests of 1864: he offered them a free stay from December to the following spring, if their winter holiday in St Moritz was not as sunny and as pleasant as it had been over the summer.
Tanned and full of enthusiasm, the British guests returned home the following spring and spread the word about their fantastic mountain winter at the Kulm in St Moritz.
Previously, St. Moritz had only been a popular summer holiday destination, but Badrutt could see the potential to extend the holiday season through the winter and with his wager, he laid the foundations for the creation of Alpine winter tourism.
The Brits returned year after year and soon found ways to entertain themselves in the snow: sledding from the Kulm Hotel onto the frozen Lake St Moritz, leading to the creation of the world-famous Cresta Run, and sliding down the mountain slopes on planks, which was the birth of downhill skiing.
Pera Palace Hotel Jumeirah, Istanbul, Turkey
The Pera Palace Hotel Jumeirah claims to be the venue where Agatha Christie wrote ‘Murder on the Orient Express’ in room 411
Pera Palace Hotel is located in the heart of the vibrant Beyoglu district of Istanbul.
It first opened in 1892 to welcome guests of the Orient Express and the hotel has played host to an impressive list of guests that includes Greta Garbo, Ernest Hemingway and Agatha Christie.
Christie is rumoured to have written ‘Murder on the Orient Express’ room 411 of the hotel, which is now known as the Agatha Christie room.
Ashford Castle, Co. Mayo, Ireland
Ashford Castle in Co. Mayo is an 800 year-old-building set on 350 acres on the shores of Lough Corrib
Underneath the historic castle lies a secret underground tunnel which dates back to 1615
Ashford Castle is an 800-year-old-building set on 350 acres in County Mayo, on the shores of Lough Corrib and the River Cong.
Once owned by Lord and Lady Ardilaun of the Guinness family, the castle has welcomed royalty, celebrities and heads of state across its illustrious history.
The included George V of England, Princess Grace and Prince & Prince Rainer of Monaco, US President Ronald Reagan, Brad Pitt, John Travolta, Jack Nicholson, Johnny Cash, Woody Allen and Mia Farrow.
Underneath the castle lies a secret underground tunnel which dates back to 1615 that was originally used as a Wine Cellar to house the Guinness family Wines and silver.
The underground tunnels have recently been transformed into an atmospheric space under the castle where wine experiences with guests can be hosted.
The Wellington Hotel, Boscastle, Cornwall
The Wellington Hotel in Boscastle dates back to the 17th Century. Recently, a guest book from the early 1800s was discovered that contains check-ins from King Edward VII and Thomas Hardy
The Wellington Hotel in Boscastle is one of Cornwall’s oldest coaching inns, dating back to the 17th Century.
Recently, a guest book from the early 1800s was discovered that contains check-ins from King Edward VII, Sir Henry Irving, Guy Gibson and Thomas Hardy, who wrote some of his famous poems there.
Among the many illustrious visitors was The Duchess of Sutherland in 1875 and 1876, who first visited after leaving her position as Mistress of the robes to Queen Victoria.
Grotta Giusti, Tuscany, Italy
Grotta Giusti was the 19th Century Tuscan villa of the poet Giuseppe Giusti
A millennial thermal cave was discovered by chance in 1849, when miners were working on the house and noticed thick steam rising off the earth
The Italian Hospitality Collection’s Tuscan Spa hotel Grotta Giusti kept one big secret very well hidden until 1849.
The building, which was the 19th Century villa of the poet Giuseppe Giusti, guards what he regarded as the ‘eighth wonder of the world’ - a millennial thermal cave.
It was discovered by chance in 1849, when miners were working on the house and noticed thick steam rising off the earth.
On further inspection, these great, humid underground chambers were revealed for the very first time and the owner decided it was worth reaping the health benefits of the naturally occurring steamy atmosphere.
Now a hotel, Grotta Giusti has 64 bedrooms and a spa with a thermal water open-air pool, underwater hydro massages and a natural steam bath in the ancient grottoes, and scuba diving in the underground hot spring lake.