A scenic fort on the harbor protected Philadelphia from an attack that never came.

Thousands of American timepieces on display in the former clock-making capital of the country.

Located within a historic park, the beacon is the oldest standing structure in Miami.

A dazzling temple featuring a towering 12-meter golden Buddha.

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

Mysterious rocks that ring musically when struck.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

This unique tower has been home to malaria-fighting bats for 100 years.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

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.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

Race through the maze, get your name on the sign.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Connecticut's shot tower is near the end of its life.

Beautiful stained glass depictions of the history of human flight fill this surprising chapel.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

A natural history wunderkammer in the middle of the desert.