Tens of thousands of tiny birds swarm into one school chimney every fall.

The seamy, underground secrets of Portland's criminal past.

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

This charmingly homemade amusement park has been growing for 40 years.

Hollowed out cedar log tubs set in an ancient towering forest.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

Home of Howard Hughes' Spruce Goose.

An annual celebration of the infamous, unsolved skyjacking.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

A South African bar inside a hollowed out 6,000-year-old Baobab.

1920's mining camp and environmental education center is serving to protect the surrounding forest, one of the last of its kind in the Pacific Northwest.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

An essential stop before plundering, BYO Cutlass.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The "lovely red Vega" of the legendary record-settling pilot.

See massive fossils that are over 200 million years old in northeastern Arizona.

Modern pyramids built to channel positive energy have also fomented local tales of animal sacrifice.

An 80-year-old house built out of newspapers.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

Vast network of air raid tunnels beneath Lombardy's capital.

Train tunnel running underneath Quebec City.