This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

Don't get it twisted: This is the oldest pretzel bakery in the United States.

One of the few remaining covered bridges in Lancaster County.

This attraction is devoted to the wonders of steam power and features a replica of one of its most public disasters.

A puppy slum that protects canines from the cruelties of the human slums.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

This simple frog painting created by musician Daniel Johnston embodies the spirit of Austin.

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

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

The romance of early commercial flight still fills this Art Deco destination.

A small chapel celebrating the spiritual bond between dogs and humans.

These aggressively sustainable art homes look like something out of 1970's science fiction.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Considered by many to be one of the most dangerous highways in Alaska.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

This doorless 20th-century elevator doesn't stop or slow down.

A Jenga-style cylindrical tower of books that appears to go on forever.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.