The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

This sandstone mansion was the home of two of Oregon's most important pioneers.

One of the world's tallest, oldest, and most disgusting chocolate cascades.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

Private collection of art inspired by cabinets of curiosity.

The seamy, underground secrets of Portland's criminal past.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A beautiful Gilded Age hotel in the White Mountains with surprising diplomatic history.

Even Henry David Thoreau found this glacial pothole irresistible.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

America's first serial killer rests in anonymity.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

These lush botanical gardens employ the most purrfect pest control force.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

Mysterious rocks that ring musically when struck.

One of the oldest surviving Swedish-American homes in the United States.

Remnants of a storybook amusement park hidden behind a strip mall.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

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

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

Meet some of the most prominent figures in Black history through life-sized wax models.

A star fort along the C&O Canal in western Maryland that protected America in three wars.