The "Seinfeld" diner.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Read a book next to a Midtown waterfall.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

World's first "penitentiary," meant to be humane, drove men insane.

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

This four-story steel sphere in Maryland was used to test biological weapons.

Explore the legends surrounding these mythical sea creatures inside this museum.

The Decoy Capital of the World.

This golfball sized platinum iridium cylinder is the official starting point for all national weight calibrations

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

The Forest Service's surprisingly sophisticated collection of wildfire prevention art features America's most beloved bear.

Ship skeletons haunt Baltimore's waterways.

An astounding collection of medical specimens, including bits of President Lincoln.