This replica of the Greek structure is in the heart of Nashville.

A beautiful South Korean gate and garden in Little Rock honors American Taekwondo.

Where animatronic singing fish go to retire.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A flat-topped butte that makes a constant backdrop for Western art.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

These aggressively sustainable art homes look like something out of 1970's science fiction.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

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

Parking garage where Bob Woodward met Watergate source "Deep Throat."

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

A historic ruin just 20 feet away from a busy highway onramp.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

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

This massive swimming pool is the high tech home to the human-powered submarine races.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

Every drop of D.C. tap water flows through this old waterworks.

These abandoned waterworks are crumbling into the Potomac River.

The span is crooked and made from two older recycled bridges.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

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