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

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Panoramic views of the city of New Haven and the Long Island Sound, with a side of history.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

An amazing collection of fantastic reptiles, amphibians, spiders, and insects.

Nature and beauty amidst pollution and industrial wreckage.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

The spectacular history of spectacles on display.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A church of bones, decorated with 40,000 human skeletons.

Thousands of well-dressed mummies below a monastery.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This Great Depression-era creation was once known as the strangest house in the world.