This taxidermy horse was a Civil War hero.

Perhaps the most scandalous statue of America's first president.

The most decorated dog of World War I is preserved in the Smithsonian.

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

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

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

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

The oldest continuously operating fish market in the United States.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

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

Home to items never before seen by the public.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.

A private residence adorned with a gorgeous mural dedicated to the buzzing insect.

This public park was the site of the largest civilian disaster of the Civil War.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

There aren't too many operational funiculars around, but Pittsburgh has two!

A giant ball made from pieces of an old Jeep.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

One of the few working locomotive roundhouses in the United States.

These gardens recreate unique and endangered Michigan habitats.