The remains of a once-famous hotel that also acted as an artist colony.

One of the largest underground systems runs under Canada's largest urban center.

A memorial to the tens of thousands of Irish who fled to North America during the Great Famine.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

The Incredible Hulk, Yoda, Mulder and Scully, and many many others watch over the mean streets of Toronto.

One of the foremost Sherlock Holmes collections is hidden away at a Toronto library.

Willy Wonka would love this weird half-a-home.

Lost subway station nestled beneath Toronto's busy commuter line.

Smallest house in Toronto sits on a lot meant to be just wide enough for cars to drive through.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

This Toronto garden collects stares and tchotchkes in equal measure.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

This urban oasis is a marvelous meld of music and landscape architecture.

A unique botanical garden housed in three giant geodesic domes.

A memorial for the mustachioed record-setting runner.

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.

Once the extravagant escape of the Ford family, this enigmatic ruin now stands as a haunting reminder of its former glory.

These strange large stones served as a campsite and lookout post for generations of Native Americans.

A permanent outdoor art installation made up of more than 100 mushroom-shaped lights.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

A repurposed railway tunnel with otherworldly acoustic characteristics.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

An abandoned railroad tunnel transformed into a creepy path for hikers and cyclists.