Radioactivity still cause for concern at this urban explorer's paradise.

An overlooked and unassuming engineering marvel.

Every Easter, a small Sicilian town builds a stunning cathedral out of bread.

A 300-ship graveyard, with a few still visible at low tide.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

The home of the morbid art of corpse plastination is open for visitors to view the fascinating, but stomach-churning process.

This ancient holy well is older than much of the city that surrounds it.

Three large boulders covered in mysterious carvings and graffiti.

This sculpture commemorates Edinburgh's sister city and their respective celebrity dogs.

This mountain is one of the largest in Scotland but is better known for its hollow insides.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

This hill nestled in the Scottish lowlands was a ritual site for over 4,000 years.

This Scottish castle has witnessed clan rivalries, Jacobite uprisings, whisky smuggling, and more.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

A Scottish manor with a history of mysterious fires, magic, and eccentric tales

Modern megaliths form this work of cosmic, Celtic landscape art.

A curious collection of mechanical moving figures.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

Largest lake in Great Britain measured by surface area.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.