First mosque in Canada, second in North America.

This unique bridge has been a staple across the Saskatchewan River Valley for more than 100 years.

The remnants of this unusual bridge await an uncertain fate.

This amazing trail among the many waterfalls around Ingleton has been enchanting visitors since 1885.

A beautiful medieval bridge allegedly constructed by the Devil.

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

The largest drain hole in the world.

If you dial the number in this abandoned office window "Sam Spade’s" secretary will ask you to leave a message.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

The first museum in the world devoted to sexual gadgetry.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

A giant interactive periodic table with real samples of the elements.

An Orwellian sculpture with eyeball cameras watches passersby.

Site of one of World War I's most horrific scenes.

The mystery of the Putim Ossuary involves a tricorn hat.

The highest point in Belgium is a staircase to nowhere.

The ornate structure is part of a building boasting more marble than the Vatican.

This church looks more like a spaceship than a house of worship.

One of the greatest maze designer’s greatest mazes.

An architectural oddity of six stories, accessed by graceful ramps.

Natural mummies hidden in the crypt of a medieval French church.

The bones of some 7,000 soldiers killed in the historic Battle of Solferino are stored here.