These early tent-shaped grave coverings are unique to Appalachia.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

These disused steel furnaces are now haunting ruins that may one day be a national park.

Once damaged by Hurricane Agnes, this bridge is now on the National Register of Historic Places.

A giant time capsule not scheduled to be cored until 2040.

Time travel with sweets across history at this research-based candy store.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.

The writing studio of an American adventure author, built in the style of a medieval castle.

This tombstone marks the final resting place of the beloved 1990's character, Ernest P. Worrell.

Wisconsin's most celebrated export gets the royal treatment on I-94.

A unique botanical garden housed in three giant geodesic domes.

A 1975 bylaw prohibits the construction of any building that would block the view of this Gothic Revival church.

One of the last remaining covered bridges in the province of Ontario.

Known as the "Kissing Bridge" for its privacy, it also happens to be the last covered bridge in Ontario.

It took over 100 years to decode this enigmatic epitaph for two buried brides.

A school teacher's massive and terrifying self-built castle.

An arresting temple full of mosaics as colorful as the politician they memorialize.

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

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

This Toronto garden collects stares and tchotchkes in equal measure.

The longest enclosed pedestrian bridge in the world spans 14 lanes of traffic and six rail tracks, all while lighting up the night sky.

This "Palace of Purification" has made many film appearances as a dark and sinister headquarters.

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