This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

An installation that makes understanding the size of the universe a walk in the park.

Six turbines towering over a wide road for passersby.

Nicolas Schöffer's massive interactive sculpture was assembled in 1961 and brought back online in 2016.

One of the oldest bank museums in Europe showcases unusual currencies of the world and other money-related miscellanea.

Learn about stars, weather patterns, or just enjoy the panoramic view of Ghent.

The world's tallest boat lift stands as a massive piece of industrial tourism.

Tintin's creator is celebrated in an immersive museum that's an astounding work of modern art.

A visionary precursor to the Internet made of index cards.

This memorial museum chronicles the apocalyptic destruction of the First World War.

Only museum in the world devoted to bookbinding and book arts holds a permanent collection representing five centuries.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

Hiding the longest subterranean river known in the world.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Medical history with an amazing, if frighting, collection of wax diseases on display.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

The Devil’s own choice when he needs a drink in Brussels.

Lavish royal estate punctuated with heated greenhouses.

The final resting place of one of the United States's greatest poets.

The oldest surviving presidential residence in the United States.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

Where America's first doomsday cult awaited the end of the world.