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

A Civil War Museum with some notable medical antiques.

The only surviving fragment of the lost Narragansett Pier Casino.

The site of one of history's most indelible and horrific tragedies.

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.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Perhaps the most scandalous statue of America's first president.

There’s a hidden military meme engraved on the World War II Memorial.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Although built to generate electricity for Marylanders, this dam has become an all-you-can-eat buffet for American bald eagles.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

This rocky spread has been squeezed up directly from the bowels of the earth.

The first transatlantic wireless signal was received at this 17th-century fort.

This huge ship ran aground and has simply been left to sit there ever since.

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

Once America's tallest structure, now a Baltimore landmark.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

The trials and tribulations of marking Poe's grave.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

A man killed in a hunting accident is eternally guarded by a granite hound tombstone.

A popular 19th-century natural landmark is now hidden within a sprawling forest.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

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