It was once the base for a series of domestic terror attacks.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

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

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The summer home of the largest colony of bats in the world.

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

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

America's first public mental health facility.

"The House That Love Built" is shying away from "The House That Ghosts Love."

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

A museum dedicated to the history and exploration of both popular music and science fiction.

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

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.