A nearly 200-year-old Catholic mission built to serve the native people of Idaho.

Berlin's old airport.

This chimerical bridge/tunnel appears to dead end right into the sea.

These were the largest wind chimes in the world when artist Tom Van Sant created them for a California mall in 1967.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

A restaurant and observation deck built in a unique broadcasting antenna.

World's smallest skyscraper, the product of a remarkable con.

A hand-built folk art installation covered with messages of God's love.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

What is it about mushrooms that makes people wish they lived inside of them?

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

The former home of the "Mother of Father's Day."

As the oldest natural history museum in the Americas, these halls contain everything from dinosaur bones to biological samples collected by Lewis and Clark.

Possibly the world's largest coin stands just outside of a Canadian science center.

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

A massive fossil of unknown origins

This historic fort spans more the 300 years.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

Soaring over the Niagara Whirlpool since 1916.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

From mining complex to industrial exhibition, this museum once played a major part in the X-Files.

This expansive bridge in the Canadian wilderness was originally just built for friends.