The oldest and smallest cemetery in Paris is only open to the public twice a year.

The secret medieval communication system will whisk your words above the noise of the crowd.

The world's tallest box hedge is found in a delightful garden.

Romans built the world's tallest artificial waterfall in 271 BC.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

A British plaque explains that a house was built using the spoils of the first international golf bet.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

The most loyal of little dogs, or a Victorian era publicity stunt?

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

Protecting the dead from opportunistic body snatchers.

A book bound in the skin of an infamous criminal, along with countless other specimens.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

360° views of the city plus five floors of optical illusions and hands-on science.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

A Romanesque tower appears when water levels drop.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

One of its engravings is believed to be among the first representations of medical and surgical instruments.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

The 20-mile causeway that separates the Netherlands from the sea.