A relic of Victorian grandeur hides beneath a busy South London road.

This octagonal cottage is the smallest and the oldest council house in the United Kingdom.

One English town's celebratory landmark spurred more trouble than anticipated.

Two beautiful Victorian-era parks replete with ornamental waterfalls and lakes.

A granite plane marks the site where a French aviator completed the first airplane flight across the English channel.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

One of the oldest seagoing boats in the world can be found at the Dover Museum.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

A grumpy old water goblin guarding an old mill on the Devil’s Stream in Prague.

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

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A Jenga-style cylindrical tower of books that appears to go on forever.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

A surreal statue honoring Prague's favorite literary son.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

The medieval "Bearded Man" relief still serves as a clever flood warning marker.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.