One-time largest man-made structure in the world will be a park in 30 years.

Holding the most bodies of any cemetery in the United States.

A spiritual vortex among the red rocks in Sedona.

19th century cemetery hidden in Brooklyn's Prospect Park.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

One of the largest public housing complexes in New York once visited by Eleanor Roosevelt.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

Four cars from the old system were once on display, but were removed in 2014.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Paths are maintained, but trees have taken over plots.

Phil Mortillaro uses keys to bring art back to the Village.

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

Unrepaired walls from a 1920 anarchist bomb attack.

Version of the French Riviera destroyed by the sea.

A decommissioned military complex that's now a modern industrial park.

A layered tribute to the work of mosaicist Isaiah Zagar.

Little Red Lighthouse under the George Washington Bridge.

The return of something once considered a basic part of life.

Series of storm drains connected to a dark urban legend.

The American rainmaker and a burst dam.

The site of Paul Revere's historic two lantern warning.

A hand-built folk art installation covered with messages of God's love.

Constructed in the 1920s, this former pencil factory is now an office building.

Ornate "Renaissance Revival" style building.