One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

This London plaque marks the spot where David Bowie's famous alien made his debut.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

The heads of two giant mythological water horses honor Scotland's horselord past.

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

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

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Hear the quietest sound from across the dome.

A student driver's nightmare.

360° views of the city plus five floors of optical illusions and hands-on science.

The longest hedge maze in the world.

A kaleidoscopic warehouse-maze of handmade neon signs.

This South London cemetery holds the remains of more than 15,000 people.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

There once was a man named Lear / Who found limericks so dear / His final resting space / Is an unusual place / Most people don’t know he’s here.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

A massive natural rock arch gives the Tuscan mountain its own window to the sky.

A mushroom-shaped outcropping that has come to be the symbol for an entire town.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

Things seem to roll, flow and run uphill on this short patch of road near Ariccia, Italy.

The only substantial part of Nazi Germany's formidable defensive line through Northern Italy that survives today, largely intact.

A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.