This leafy estate is worth $18 million and is so grand it has two mailing addresses.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

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

A wondrous old library overlooking the nation's capital.

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.

Profile of a sleeping person 4km long in 250m high cliffs.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A collection of human remains, animal body parts, and other macabre curiosities all legally for sale.

This natural sea cave hides a small wonderland of natural turquoise beauty.

The whimsical legacy of a Canadian artist.

Outsider art meets hard scrabble mountain life in this woodcarver's home/art piece.

This egg-shaped treehouse was inspired by "sport sleeping."

This Canadian exhibit with claims as the largest one man taxidermy collection in North America.

Three young men who lived on this street are honored for their service during World War I.

This patch of old-growth forest is home to Canada's gnarliest tree.

This illuminated sign was the first of its kind in Canada and remains a vestige of the Atomic Age.

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.

The scattered debris of a T-33 Canadian naval jet crash from 1963 now stands as a memorial.

When North America was covered in ice, this was an oasis in the frozen desert.

This now abandoned arch bridge was constructed during the Great Depression.

A collection of Inukshuks built and left by several hikers.

This Haudenosaunee restaurant is a delicious tribute to indigenous cuisine.

Dedicated to the people of Indian Head, Saskatchewan.

Watch bison, elk, and other wild animals up close at this national park.