Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

The depictions of slaughter are surprisingly detailed at this mysterious ancient site.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

Did Inca children also slide down these smooth rocky slopes above Cusco?

A jungle cave in Peru of unknown depths, otherworldly sounds, and strange nocturnal birds that navigate by echolocation.

White llama terraces dazzle in Peru's "other Machu Picchu."

The world's fifth tallest waterfall is a spectacular silver chute of water that cuts through the cloud forest in northern Peru.

These giant mummies are set ominously into a Peruvian cliffside and topped with real human skulls.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Sleep in a glass pod dangling off a cliff.

It's 2 billion years old!

Legend says that this short Canadian tunnel still holds the dying screams of a girl who burned alive.

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

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

Where a young athlete began his run across Canada after losing his right leg to cancer.

This rocky spread has been squeezed up directly from the bowels of the earth.

An ancient Viking village in North America that predates Columbus by 500 years.

Hundreds of enormous icebergs drift through this waterway every year.

Made from local Irish moss, this pie is served only in Prince Edward Island's potato museum.

This engineering marvel is the longest bridge in Canada and one of the longest spans in the world.

Go inside the house that inspired L. M. Montgomery to create one of literature's most beloved heroines.

Rusty red sands line the shores of this Canadian Province.

The first "applecore" style lighthouse in Nova Scotia.