On the Oregon coast there is a natural hole that seems to be draining the sea.

This dramatic rail curve was once the target of a failed Nazi attack.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

Memorializing an American tragedy of massive proportions.

An abandoned railroad tunnel transformed into a creepy path for hikers and cyclists.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

A miniature golf course crafted inside the world's largest simulated cave.

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

Nothing says indulgence like a 1,500-pound chocolate castle.

The pop art icon's gravesite is broadcast 24 hours a day on his museum's website.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

This secluded walking trail is a hidden gem of a Pittsburgh park.

There aren't too many operational funiculars around, but Pittsburgh has two!

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.