One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

An early 20th-century bullring converted into a modern shopping center.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

This bridge was constructed from the rubble of the infamous Bastille.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

A bit of retro transportation flair preserved in the world's largest department store.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Pilgrimage site for star-crossed lovers.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

This spire on an Austrian mountain is wrapped around a long spiral slide and has the world's tallest wooden observation deck.

Double spiral staircases are not unheard of, but they are very rare.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Fantastic stories on a miniature railroad.

An Austrian house of bones filled with hundreds of intricately painted skulls.

The world's oldest known salt mine.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.