An ethereal glowing blue ocean cave in Croatia.

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This taxidermic smorgasbord was co-created by an artist poached from the Museum of Natural History.

"Gnome Chomsky" was once the largest gnome in the world, but is now simply tall for his kind.

One of the world's largest model railroads is a mind-boggling achievement.

“Invented in Key West, Perfected in Brooklyn."

Brooklyn vintners creating world-class wine in a city not known for its vineyards.

Take in a rare, face-to-face glimpse of Lady Liberty at this tucked away Red Hook park.

Micro-distillery in Brooklyn produces New York’s first homemade rum since Prohibition.

A world of whimsy and wonder aboard a one of a kind historic landmark vessel.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

Dental instruments from the illustrious history of American dentistry.

One of the oldest living oak trees in the Southeast.

Dedicated to the history of the health sciences.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

A historic observatory precariously perched at the "Top of Europe."

I-95's Tijuana-style celebration of kitsch at the Carolina border.

North America's largest accredited model railroad museum.

The world's second-longest burning light bulb.

A toweringly silly piece of modern art has been delighting locals since the 1980s.