A life-sized mammoth sculpture marks the spot where the remains of a Columbian mammoth were discovered in 2005.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

Just outside the Ohio Supreme Court sits a testament to justice.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

The mounds at this site were reconstructed with the help of archaeologists and historians.

Abandoned former poorhouse, bible college, and haunted house in an Ohio hamlet.

A gas station has taken the place of the home of the 19th American President.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

Central City celebrates its most famous madam by racing beds down Main Street.

A research lab and hands-on museum where visitors can experiment with retro technology.

"All Mountains - All The Time."

Rather than a run-of-the-mill franchise hotel, this lodging has been decked out in dinosaur decor.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

The museum calls itself the "National Museum of the Paranormal" and is full of eerie oddities.

A remarkable time capsule of American manufacturing deep in Maryland coal country.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

A beautiful hidden gem in central West Virginia.

The highest point in Maryland is only accessible by hiking through another state.