The vaulted ceiling is home to a scurry of “squirrelgoyles.”

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

Canada's largest graveyard boasts a lot of noteworthy artifacts as well as its own computerized mapping service.

One of Canada's oldest museums, the beautiful Redpath has been serving up Natural History and Ethnography since 1882.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Every year, the colorful murals of Montreal get a complete makeover.

A once-groundbreaking power plant turned into a hotel and mini-museum of archeological and geological wonders.

A whimsical roadside community of little metal people.

The walls of the iconic dome are hollow and have a secret stairway.

An Industrial Revolution-era public work that purified water using nothing but sand.

People escaping slavery may have hidden inside a corpse vault.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A derelict bit of transportation infrastructure hidden in the woods.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A historic neighborhood church is reborn as a psychedelic arts collective.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Home to items never before seen by the public.