Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

The wooded estate of the Forest Service employee responsible for D.C.’s cherry blossom trees.

The Forest Service's surprisingly sophisticated collection of wildfire prevention art features America's most beloved bear.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

This New England drive-in was built to straddle the border between two states.

The summer home and later final residence of acclaimed American sculptor Augustus Saint-Gaudens.

Row, row, row your pumpkin quickly down the stream.

A 12,000-year-old bog boasting rare plants and fauna.

Nature and religion are reunited at this unconventional church in the forest.

This small stone chapel is a hidden gem just outside the University of New Hampshire campus.

Come for the gun-toting hillbilly madman, stay for the ice-cream loving basketball bears.

Stumps of an Ice Age forest, visible only at low tide.

A short nature trail winds through the greatest works of poet Robert Frost.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Around 100 sculptures from artists all over the world decorate the hiking trails surrounding this locale.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.

This 150 foot seven-tiered cascading waterfall is one of the hidden gems of the White Mountains.

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

Even Henry David Thoreau found this glacial pothole irresistible.