Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

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

FDR's Art Deco hospital tower was hopelessly inefficient.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

This elaborate towering structure was once famed for its revolutionary height.

Dr Barnes' $25 billion private collection of art and arboretum.

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The most confusing clock in New York.

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Elevated freight railway turned wildly successful urban park.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

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

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Beautiful mosaics cover the first stations opened on New York City's newest subway line.

The "Seinfeld" diner.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Oldest church in the United States that is still in continuous use.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.