The remains of Crystal Palace Great Exhibition of 1851.

The most metal church of all time was built in record time because of an international, pious pissing contest.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

A surprising and unconventional mosque hidden in the subsoil of Istanbul.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

A lively circle of dancers in the Georgian capital commemorates an ancient rite of spring.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

With over 10,000 lights, this engineering marvel lights up the city after dark.

This police call box harkens back to an era of pre-radio communications, and has a rather unique feature.

This magnificent mural was created with over 30,000 colored bricks.

One of the last remnants of the Bessemer process that revolutionized steel production during the industrial age.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

The remains of the debtor’s prison that shaped Charles Dickens’ life and writing.

With a history stretching back to the 16th century, this pub has a few stories to tell.

A recently restored Shoreditch landmark with ties to Jack the Ripper.

These oversized fruit sculptures honor the contributions of the Windrush generation.

A historic arboretum and non-conformist, non-denominational park cemetery.

Hundreds of hidden passageways weave through the old quarters of Lyon.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

The world's first funicular powered by a steam engine.