30 years worth of pressed-tin, bakalite, and characters both loved and forgotten.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

These 20-foot sculptures will help guide you from the local train station to the local sculpture garden.

World War II bunker still standing on the New Jersey beach.

One of the world's largest model railroads is a mind-boggling achievement.

Step inside Lucy, the world's largest "elephant."

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

A unique sculpture park that specializes in the huge and bizarre.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

A winding, cliffside stretch of road overlooking the Delaware River.

You must take the A train... to the last active cemetery in Manhattan.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

A bit of retro transportation flair preserved in the world's largest department store.

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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Ride the subways of yesteryear.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.