Historic psychiatric asylum and most-filmed location in the Great White North.

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

This expansive bridge in the Canadian wilderness was originally just built for friends.

A former top secret nuclear fallout shelter now operates like a hotel stuck in the Cold War.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

This modern arts center is built around a gem of late-Baroque architecture.

Medical history with an amazing, if frighting, collection of wax diseases on display.

Meet the bronze beloved pet to a family of famous peeing statues.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

This sublime architectural marvel is a rare example of an expressionist church.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

Sweden's first electric elevator remains hidden within a fortress-like building.

Inside this church, a monument honors the first burial site of the famed philosopher.

Sweden's largest optical telescope sits on a rooftop in Stockholm.

Stockholm's last remaining paternoster elevator.

For a couple of months each year this Swedish city turns into a festive neon phantasmagoria.