Something's watching you.

This snug medieval lane is one of the narrowest streets in the world.

This once-derelict building is now one of the most beautiful bookstores in the world.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

This massive underground salt mine now holds a sci-fi theme park in its depths.

The world's largest fully steerable radio telescope.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.

A historic coal mine that doubles as a museum and tourist attraction.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Dating back to the 1800s, two imposing buildings in Michigan have had countless transformations over the years.

Part taxidermy workshop, part natural history museum this Michigan destination shows off its dead animals and helps you mount your own.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

The unusual medical inventions of the man who gave the world Corn Flakes.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

The world’s largest Masonic temple was saved by the White Stripes.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

Berry Gordy Jr.'s old home was the original headquarters of Motown Record Corporation.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

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

This whimsical campus lawn is dotted with large sculpted numbers and hidden mathematical formulas.