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.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.