A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

A pair of connected skyscrapers form this symbolic gateway.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.

Structure built from the skulls of vanquished foes.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

Museum featuring strange and enchanting toys of the past.

Video games, body language, and postal history are all on display in this Swiss museum.

A symbol of friendship between the mountainous regions of Switzerland and Bhutan.

The world's longest and deepest train tunnel.

These magnificent 240-year-old machines are considered distant ancestors of the computer.

Extensive private collection of authentic Medieval devices used for human torture and execution.

Abbey built on the ruins of Roman catacombs.

Vines grow up the metal bars in this public park created from an old machine factory.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

At 929 pounds and 26 feet tall, this stainless steel fork can only be used by the likes of King Kong.

Over 3km of caverns and caves at the Switzerland-France border contain the largest underground river in Central Europe.

Museum of science fiction, utopias, and extraordinary journeys of the mind.

A mythically themed self-built sculpture park.