An unusual assortment of steerable wooden sleds is on display in a library in New Jersey where they were first invented.

The illuminating collection of L.A. street lights is run by the city and only opens one day per month.

The Belgian library displays burned books that were salvaged from the fires of both world wars.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

A technicolor place of worship for Elevationists.

The home for all things Kool-Aid offers everything except a chance to actually enjoy the drink.

100 massive sculptures in the Hudson River Valley.

Overshadowed by quilts, the artistry of these patterned textiles went underappreciated for too long.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

The United States Capitol's former columns still stand.

Art deco landmark on the outskirts of Washington, D.C.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

Hear the quietest sound from across the dome.

The 28-foot granite map plots the locations of 40 theaters in New York City.

Possibly the world's oldest rug, this Egyptian relic is woven entirely from ancient cat hair and once carried a mummified human foot.