The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

The ghost town that ended up on Ebay.

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

This cemetery features modernist statues as strange as its name.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A fantastic castle rumored to be the birthplace of King Arthur.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

See massive fossils that are over 200 million years old in northeastern Arizona.

Catacombs turned marketplace.

Quite simply the largest tree in the world (by volume).

Eighty million natural history specimens call this gargantuan museum home.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

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

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

The beautiful baroque library of the Hapsburg empire.

Macabre astrological automaton clock dating to the late 1400s.

Famously misunderstood wonder of the ancient world

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.