Profile of a sleeping person 4km long in 250m high cliffs.

One of the largest underground systems runs under Canada's largest urban center.

This inexpensive lodging house was once a prison notorious for its inhumane practices.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Canada's subterranean Cold War museum has doubled as a movie set.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Soaring over the Niagara Whirlpool since 1916.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

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

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

A city's controversial tribute to its founder depicts townspeople flashing their bare behinds.

Germany's last remaining Lenin statue has become a lightning rod of debate about the country's divided past.

It's possible to walk inside one of the largest Neolithic tombs in Britain.

Europe's largest prehistoric mound – burial site of a legendary king?

The largest stone circle in the world has ended up bringing up more questions than it has answered.

This massive chalk hill carving is one of England's most beloved giant horse geoglyphs.

The oldest working mechanical clock in the world.

Famously misunderstood wonder of the ancient world

A beautiful maze marks where three countries meet.

A moving memorial to the fallen and missing from WWI trenches.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

Christ's blood preserved in a Belgian town.

The towering Pinocchio stands 63 feet tall in the Italian village his creator frequented as a child.