Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Walk down an otherwise nondescript alley near Washington Square West in South Philly and find yourself in a vivid, immersive mosaic wonderland.

A layered tribute to the work of mosaicist Isaiah Zagar.

The house where John Wilkes Booth conspired with his co-conspirators.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

An overlooked memorial honoring the local Washington residents who died in World War I.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

There’s a hidden military meme engraved on the World War II Memorial.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The "lovely red Vega" of the legendary record-settling pilot.

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

This lovely tree was a thank you gift from the man known as "Public Enemy No.1."

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.