Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

Metal dinosaurs lurk in a sculpture garden on the outskirts of a popular resort town.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

The first memorial dedicated solely to the Black troops who fought for the Union.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

The towering figures were created from the cemetery's fallen old-growth trees.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

A celebrity from the late Cretaceous period.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

A super-sized promotional trick that is now a D.C. landmark.

A nostalgic bibliographic gem.

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

A historic neighborhood church is reborn as a psychedelic arts collective.

On Hilton Head Island this bronze King of the Sea rules all things briny—and lets you know if you’re late for lunch.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

Sip coffee and talk politics at this landmark cafe in Astoria's Little Egypt, a contender for the title of America's first hookah bar.

The last slot car racing arcade in Brooklyn is keeping the dream of speedy little autos alive.

The painter who popularized "bulls" and "bears" as symbols for the stock market didn't get a proper headstone for over a century.