Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

This lighthouse has been guiding shipping into the Golden Gate since before the American Civil War.

Ride on a fully-restored Nike nuclear-tipped missile elevator from the Cold War.

Concrete strongholds stand guard over the Golden Gate.

Dive bar built out of the remains of a whaling ship.

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.

This unusual lava tube spouts seawater during high surf.

A controversial memorial at the place where Captain Cook met his violent end.

Longest fortress system anywhere in Europe.

The oldest arboretum on the Dalmatian coast doubles as the gardens of Kings Landing in "Game of Thrones."

American artist J. Alden Weir purchased this 60-acre estate for $10 and a painting.

After the comedian dissed a Connecticut town on his show, they named a sewage treatment plant after him.

After decades of neglect, a brutalist icon is getting new life as an eco-friendly hotel.

This classic steam-powered train takes tourists on a nostalgic trip around the Connecticut River Valley.

British troops and Prohibition couldn’t stop this spot from becoming one of the United States' oldest continuously-run taverns.

The US Navy's only submarine museum is also home to the world's first nuclear submarine.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

This store also houses a museum dedicated to the history of these small, historic community shops.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.