The sole surviving relic of the San Francisco neighborhood cobbled together from old horsecars and streetcars.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The unusual patterns in this rock formation result from two distinct modes of weathering.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

A tunnel with windows, so you don't miss out on the impressive views.

The fifth-longest natural arch in the world, and the longest outside China.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A house carved into a rock in the 1940s.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The remnants of a 19th-century ironmaking complex hidden in the woods of Connecticut.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

An abandoned gun-funded 19th century utopia.

New Preston and Kent, Connecticut - where Friday the 13th, Part 2 was filmed.

These Benedictine nuns have been making artisanal cheeses since before it was cool.

The "possessed" house that inspired "The Haunting in Connecticut" book and movie.

This small-town pizzeria won the Hollywood lottery.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.