This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

A self-built castle made by a mysterious man.

Every Christmas, one Arizona city makes the most of its dry climate by creating an arid desert tannenbaum.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

Housing a morgue, rare and confiscated weapons, and autopsy remains, the Vancouver police museum displays the dark side of Canada.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Hiding the longest subterranean river known in the world.

Unchanged for centuries, this medieval library keeps its books in chains.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

Museum preserving torture methods from the past.

Gutted during the Liverpool Blitz, this architectural husk has been left destroyed in honor of the dead.

A walk through the historic city center, under the streets of Seattle.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

The stately remains of Llywelyn the Great's mighty fortress.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

This massive subterranean fissure is known as the "underground Grand Canyon."