A little-known hot spring haven right below the highway.

A hidden beach at the end of a tunnel of mangrove trees.

Commonly referred to as the most photographed Victorian home in the United States.

One man's extraordinary topiary garden in a small South Carolina town.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

Walk the whole Mississippi River!

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Over fifty whirling pools left by the glacial age.

Garden dedicated to native carnivorous plants and site of huge flytrap heist.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

A bigger-than-life pun that has become a beacon of altruism.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Mile-long cave system near Great Smoky Mountains.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

Only known mainland rookery of the threatened Stellar sea lion.

The neighborhood shop is a sort of tiny cactus museum full of exotic specimens you can take home.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

"The House That Love Built" is shying away from "The House That Ghosts Love."

The longest continuous lava tube in Oregon.