This fortified town dating back to the 1400s is often described as an open-air museum and is a protected National Monument of Bosnia and Herzegovina.

Atop this former dutch railway office sits an interstellar work of art.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

A gigantic teapot sitting on top of a parking garage in the center of Utrecht.

The cutest way to stay safe in traffic.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

A uniquely preserved neo-Gothic church that is now home to a collection of art and woodcarvings.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

This work of art, which took 35 years to complete, has a motorway running through it.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

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

Also known as Napoleon's Canal, this waterway was created on the orders of the general, and construction was interrupted by Waterloo.

This picturesque monastery at the base of a cliff is a peaceful oasis open to all visitors.

The scars of World War II are preserved on its walls.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This heavily worn bas-relief was once an honored fertility symbol.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

Hidden along this old street in Antwerp is a surreal monument of a bronze arm sprouting four hands.

This interactive sculpture allows visitors to leave a message in case a friend passes by.

A Tudor-style castle in Brazil holds one of the world's largest armory collections.

This haunting sculpture stands as a memorial to the torture victims of the Brazilian military dictatorship.

From 135 feet high riders plunge down the world's tallest freestanding body slide at 65 mph.