This abandoned sea fort has become an accidental bird sanctuary.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

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

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

A priceless collection of the Nation's cryptologic history.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

In the early 1800s, surgery was also a show.

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

The ruins of this once gorgeous medieval church are still standing, despite the region's constant flooding.

A solemn, monumental, kitschy palace of worship honoring victory in the Great Patriotic War.

A downtown park built on top of unclaimed graves.

This surreal art house looks like a geometric version of a small chapel.

Home of St. Urho, the fictional patron saint of Finland.

This skewed English house has looked like it's going to fall over for centuries.

The world's largest floating loon bobs in the lake to kick off an annual festival.

The first privately owned air raid shelter in Britain, built after a horrifying night of Zeppelin bombings.

Britain's answer to the NSA is based out of this deliciously-named circular headquarters.

This replica of an 8th century burial ship actually sailed to Norway before returning home to Minnesota.

On the windswept Dakota plains there is a memorial to circus workers who were struck down by lightning.