This building at the south end of the boardwalk was once home to the U.S. Life-Saving Service and the U.S. Coast Guard before being rescued itself.

Just outside the Naval Academy, Hell Point is a historical marker that could easily be the point where failed students wait for the bus.

FDR's Art Deco hospital tower was hopelessly inefficient.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

One of the oldest active carousels in the country—but it might be missed by all but the keenest-eyed boardwalk strollers.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

An isolated island home to one of the oldest English-speaking communities in the region and Maryland's state dessert.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones’ locker.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

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

The land is home to swimming ponies and a legendary 18th-century treasure.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

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

A serene garden path lined with 36 haiku stamped into clay stones.

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

A natural formation that resembles a camel resting in the New Mexico desert.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

These tall, red sandstone pinnacles outside Moab are often forgotten amid their more famous neighbors.