A vast array of tropical plants collected by a vacationing couple.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

A graveyard of bathyspheres and diving bells paints a weirdly accurate account of ocean exploration's rickety history.

Town of spiritualists and mediums in Florida.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

This phone booth-sized municipal building has been a piece of police property for more than half a century.

The bottle house obsession struck a Florida man in his retirement, and now he can't stop building.

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

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

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

This spot memorializes one of the greatest plays in NFL history, unless you happen to be a Raiders fan.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Copenhagen's celebrated theme park and gardens.

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

This quirky hot springs town known to locals as "T or C" was named after a radio show.