The burial grounds of a secret society includes fences topped with fake Tesla balls.

Over 1.3 million confiscated wildlife products fill this macabre menagerie of illegal animal specimens.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

While comics are the main attraction at this megastore, the second floor plays host to an exhibit fit for a museum.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

This small, but beautiful waterfall has attracted visits from artists, composers, and two United States presidents.

Indiana's greatest rare bookstore has a special shelf for Hoosier authors.

A historic cemetery with unique artwork, a Civil War fort, and also happens to be the site of the Battle of Bladensburg.

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

Largest Roman Catholic church in North America.

Recorded as the first person buried in Arlington Cemetery.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

Home to a vast and influential collection of Shakespeareana.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

This groundbreaking 16th-century map is known as "America's birth certificate."

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