Art deco landmark on the outskirts of Washington, D.C.

Largest Roman Catholic church in North America.

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

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

At 207 feet, one of the world's longest continuous escalators.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

The "lovely red Vega" of the legendary record-settling pilot.

A much-maligned monument to teetotalism.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Home to items never before seen by the public.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

This opera house along the banks of the Connecticut River has two Tony Awards to its credit but it’s never staged a single opera.

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.