An iconic waterwheel in the Pennine Hills marks the location of one of Britain’s most profitable lead mines.

This gorgeous space is England's largest independent library outside of London.

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

A scattered trail of street art adds a pop of color to the city's stark structures.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

An eerie smiling woman looms above the granite tombstones.

Civil War soldiers, captains of industry, and paupers all interred on historic grounds.

The construction of a tram line unveiled hidden remnants of the old medieval city.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A Nesting Doll of Churches.

The yawning maw of this pagan visage is said to bite off the hands of liars.

The underground sanctuary of a mysterious ancient cult.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Pompeii's less famous neighbor is still revealing her secrets.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Metro station with a claim to rock n' roll fame.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.