Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

Four giant movable street lights decorate this modern Rotterdam square.

This hotel was once home to a steamliner company and became the final rest stop for Europeans heading to the New World.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

See what remains of a once grand ancient Roman circus.

A beer pipeline runs beneath Bruges.

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Grab a pint of British-brewed ale or cider and a hot roast pork bap at this quintessential London pub.

The last vestiges of a magnificent Victorian-era train station can be found in this pub.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

This underpass became an unlikely piece of cinematic history after its appearance in 'A Clockwork Orange.'

The last four extravagant street signs of London's historic banking street.

Pop culture has helped to keep this iconic British building from being destroyed.

Artists and musicians now rule over this former rail station.

Catacombs turned marketplace.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Dedicated to one of the nation's worst engineering disasters.

Each section of this public work of art represents one of the city's guilds.

This monument depicts a harrowing event involving an escaped polar bear.

Atop this arch, during the 16th-century, a sermon was given to those suffering from plague.

A reportedly haunted parking structure with alleged links to Jack The Ripper.