The eerie remnants of an ancient forest were hidden under the sand for centuries.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

From 135 feet high riders plunge down the world's tallest freestanding body slide at 65 mph.

A unique work of automotive art calls this shopping center home.

Houses are tucked between, on, and underneath giant boulders.

During the holidays, a vintage subway train whisks New Yorkers back in time.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

An architect transformed this abandoned cement factory into his castle-like workshop.

The top of society once luxuriated in this world-class hotel, which continues to impress, even in ruin.

This is what trains will look like after the zombie apocalypse.

Led Zeppelin wrote some of their most iconic songs at this little 18th-century Welsh cottage.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

England's steepest street has such a drastic incline that locals tie their parked cars to lampposts when it gets icy.

This tiny little island has, as the name says, just enough room for its single house.

At this ancient settlement at the foot of Mount Babadağ, honeycomb tombs are carved into a round cliff.

An Aztec snake god has taken the material form of an apartment complex.

These tiny cabins on a cableway have been carrying visitors at a Baltic resort down to the beach since 1912.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The world’s highest ski resort was deserted after an 18,000-year-old glacier melted away.

For decades, a bottle factory dumped their waste into these waters—now it's considered the best sea glass beach in England.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.