Secret additions to tourist attractions around the world
An apartment in the Eiffel Tower, a tiny police station in a lamp post, secret passageways and unmarked floors.
These may sound like ideas straight from a spy movie, however, they are just some of the real - but hidden - additions to popular tourist attractions around the world.
While some are disguised, others can be spotted – if you know where to look.
One of the most iconic structures in the world, the Eiffel Tower in Paris, contains an apartment, Express.co.uk reported.
In 1889, engineer Gustave Eiffel had a private apartment constructed near the top of the 320 metre-tall tower.
Only he could access it, however, after years of being off-limits, visitors can now look inside.
In London, Trafalgar Square has an ornamental lamp post that once doubled as the country's smallest police station.
Inside, it had room for two prisoners, a phone line to Scotland Yard and a vantage point to watch crowds in the busy capital city.
While it was constructed in 1926, it is now reported to be used by council cleaners to store their equipment.
London has other hidden structures, too.
Beneath a section of the city's A212 road is the abandoned Crystal Palace station subway.
Although the station, built in 1865, was destroyed by fire in 1936, the subway was later used as an air raid shelter.
Parts were later used for the odd party and by children to play in but it was blocked off in 1990, the Express reported.
Some parts of the station remain and attempts are being made to reopen it.
In New York, hidden, private or now-unused spaces in tourist attractions seem common.
The Statue of Liberty's torch was once accessible to the public, but it was closed after it was damaged by a German act of sabotage in 1916, according to AM New York.
Now, the highest point which can be visited is the crown.
Many believe the top floor of the Empire State Building is 102 - but there is in fact a floor 103.
A small balcony with low railings, it is often only used by celebrities, according to the Express.
At the Grand Central Terminal, unknown to most, is a tennis club.
Located in the upper floors of the building, the Vanderbilt Tennis Club has been operating since the 1960s.
The Waldorf Astoria hotel in the city has its own secret underground railway.
President Franklin Roosevelt used to travel from his home using the underground route, the Express reported.
Also in the US, Mount Rushmore is home to four huge granite statues of former presidents; George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln.
Behind Lincoln's head is a hidden room, the Hall of Records, where documents tell the nation's history - but tourists are not allowed.
At Rome, Italy's Fiumicino-Leonardo Da Vinci Airport stands an almost 20-metre statue of the painter and inventor the airport takes its name from.
Although it was built in 1960, it was not until 2006 that a worker found a hidden compartment half-way up the structure with two documents inside, according to Atlas Obscura.
Both were written in classical latin, one revealing details of those who were at its opening ceremony and the other, the history of the area.