Cave on extinct volcano, once home to famous mathematician Pythagoras.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

A 18th century graveyard and its astonishing cortege of macabre iconography.

The largest terracotta fountain in the world, built to commemorate Britain’s Victorian achievements.

One of the first monuments dedicated to the accomplishments of the great Vice Admiral, Horatio Nelson.

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

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

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Giant topiary dog once played a role in a terrorist bomb plot.

Two towns are linked by an engineering marvel masquerading as a boring suspension bridge.

The remains of a medieval wall discovered in the basement of a jewelry store.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Hamburgers are intensely proud of their tunnel beneath the river.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

Once a dumping spot, now a park with a kayak launch.

Oldest surviving example of a Dutch saltbox frame house in America.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

Sniff the Titan Arum's rotting flesh.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Eighty million natural history specimens call this gargantuan museum home.