A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

The longest and tallest aqueduct in Britain can actually be sailed across.

This lonely cast-iron structure is the only wave-washed lighthouse of its kind left in all of Britain.

Three bridges straddle a stream, one stacked upon the other.

The ghostly remains of what was once the world's richest copper mine.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

Crumbling pyramids and temple ruins stand within the shadow of this sacred butte.

These Nubian pyramids are strange and unique, even by pyramid standards.

Remains of an abandoned coral city.

The farthest northwesterly point of the British mainland is one of the most remote places in the Scottish Highlands.

Believed to be the smallest castle in Europe.

Take a hike to this remote, scenic tea stop in the Canadian Rockies.

Micro-nation based around a nine-story high illegally built tower.

Constructed along the shores of Lake Zurich, this pavilion is a walk-through work of art.

Created by a pair of artists, this former hotel was designed to provide a minimum of everything including comfort.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.

Vines grow up the metal bars in this public park created from an old machine factory.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

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

The immortal Hollywood star rests in peace in an unassuming Swiss village cemetery.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

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