This unusual structure may be on its way to becoming a cultural landmark in Toronto.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Known as "Toronto's Flatiron."

This whimsical fountain pays tribute to Toronto's four-legged friends.

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

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

The Catskills retreat of naturalist writer John Burroughs.

A modern addition to the Greenpoint skyline.

Nature and beauty amidst pollution and industrial wreckage.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

A spiritual vortex among the red rocks in Sedona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Only hotel where you can legally launder money.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Two thousand artifacts from around the world collected by one woman who loved to travel.

The Wright Tavern is possibly the most important building in Concord Massachusetts to the American Revolution.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Built in 1821 using rooms from another estate, the Phillips House is the only historic home on scenic Chestnut Street open to the public.

A burial ground for workers at one of Hawai'i's largest sugarcane producers that laid buried for decades.

This monument built by Japanese American immigrants spent decades underground.

Now a pedestrian bridge, this was once part of a narrow-gauge railroad that ran along the east coast of Kauai.

Hawai'i's oldest wooden house was shipped around Cape Horn from Boston in 1820.