The celebrated eyesore created by starry-eyed sweethearts.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The world's longest known cave system.

A modernist landscape of water and sci-fi concrete.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This small Spanish village still pays homage to the Spaghetti Western films that were shot there in the 1960s.

One of the largest underground systems runs under Canada's largest urban center.

The southernmost postal office in South America.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A lush indoor jungle fills this bustling Madrid transportation hub.

A pair of gigantic baby heads greet passengers at Atocha Station.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Once a resting spot for King Fernando VII.

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

This fantastical faceless sculpture in Spain is on the grandest scale.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

An impressive site containing some of the earth’s rarest living fossils.

An ancient neolithic tomb that only sees the sun twice a year.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

One of the few places in the world home to living stromatolites.

Come for the flowers, stay for the bats!

Alien rock formations grown from the sands of an Australian national park.