A fantastic castle rumored to be the birthplace of King Arthur.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Remnants of a Victorian garden feature sitting in public woodland.

Hear the quietest sound from across the dome.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

The anatomical-pathological collection of a man who changed surgery.

A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Catacombs turned marketplace.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

A special shop catering to the needs of things that go bump in the night, and also helps kids become writers.

The longest hedge maze in the world.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Walk through Czech history in Prague's largest graveyard.

Two stunning 17th-century libraries and a cabinet of curiosities.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Countless grotesque faces stare out from this eerie Prague art wall.

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.