Places Airlie Wants to Go

A subterranean playground in an abandoned slate mine.

This secret Swiss fortress is disguised as a harmless pink house, complete with fake windows.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

Stockholm's deepest subway station is also a stunning ecological wonder.

This disused Cold War bunker has been restored to all of its early 60s glory.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Geodesic dome luxury retreat in the Scottish Highlands.

Remnants of a Victorian garden feature sitting in public woodland.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

An abandoned quarrying village turned commune is now a hub for learning the Welsh language.

On a site with a long military history, a 1980s shelter.

The largest greenhouse in the world is home to over one million types of plants.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

The longest and tallest aqueduct in Britain can actually be sailed across.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

These haunting ruins belong to an ancient village that once had one hell of a view.