This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

England's most notorious suicide spot.

This star-shaped artillery fort protected the mouth of the Thames from the 16th century to the Second World War.

This stream-carved gorge has inspired poets, hidden smugglers, and trained soldiers, all without losing its beauty.

An avant-garde artist is survived by his seaside garden.

The Origin of On the Origin of Species.

Now isolated, this church was once the center of a bustling village that succumbed to the Black Death.

Neon artworks light up this dark Edinburgh tunnel.

Repository for more than 22 million pickled specimens.

A comic book store that puts the marvel back in marvellous.

The monster at the center of the Darwin Center Spirit Collection.

One of the few surviving street funiculars in the world.

The longest and tallest aqueduct in Britain can actually be sailed across.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

After years of slow decline, a derelict Gothic castle is now being restored to life.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

These haunting ruins belong to an ancient village that once had one hell of a view.

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.