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

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

This 1967 experiment in modular architecture was designed to be a new model for urban living.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

Vancouver's only resting place for the city's deceased.

A unique spiral staircase that doesn't quite make it up to the top floor.

Surprisingly Delicious Asian-Style Hot Dogs.

This Art Deco masterpiece has stood in for some of the most famous buildings in comic book history.

Traditional 15th century Chinese garden in the middle of Vancouver.

This Elizabethan hedge maze is one of only six in North America.

Nine nice parcels of land along a flight path offer a quiet respite... until a plane soars overhead.

Revitalization efforts converted a former U.S. military heliport into a sprawling urban park.

Inside this German disco, visitors can take a literal ride on the dance floor.

This decommissioned nuclear power plant offers tours of its Communist-era control room and reactor hall.

Named after the German word for "a longingness to travel," this park brings together thousands of city and street signs from around the world.

This natural history museum houses one of the world's largest rat kings, a terrifying jumble of tangled rodents.

An ancient pagan site swirling with legends in the foothills of Franconian Switzerland.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

In 1830, cemetery workers in Cham unearthed a chamber housing thousands of skeletal remains from the 13th century, which can still be viewed today.

One of the most easily accessible examples of the rare 1960s UFO houses.

This former steel and coal plant is now a neon-lit industrial fantasia.

A quaint Russian village in the middle of a German metropolis.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

These 18th century gardens tell a rocky story of the son of Odysseus.