Take a sea tractor to the Art Deco hotel on the island that inspired Agatha Christie.

This huge metal monument is slowly being stripped to its concrete skeleton.

This heart-shaped island looks substantially less lovely after a recent bulldozing project.

A musical instrument played by the sea.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

Bridge that died in war and was resurected.

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

Ride in 1960s style on the private luxury train Marshal Josip Tito used to travel around Yugoslavia.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

A unique two-level bridge designed to honor a king.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

An interactive exhibition space dedicated to the kinetic sculptures of Swiss artist Jean Tinguely.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A church of bones, decorated with 40,000 human skeletons.

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

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.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.