Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

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

The world's longest and deepest train tunnel.

Hindu temple of the dead home to hundreds of long-tailed macaques.

Three wildly colorful calderas top this otherworldly volcano chain.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

This museum tells the story of lake dwellers from 4000 BC to 850 BC, replete with stilt houses and goats.

On Japan's Tashirojima Island, cats are king.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

The Uros people live on floating reed islands in lake Titicaca.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

An unexpected desert oasis in South America.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Ruins of a German castle on top of a towering stone pillar.