Apparently, the whole cosmos emanates from this plain concrete tower.

This terrifying glass bridge on the side of a mountain cracks as you step on it.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

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

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

The winter home of thousands of beautiful snow geese and sandhill cranes.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Italian cave with exceptional acoustics and an unsavory history.

One of the most well-preserved temples of ancient Egypt.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

The largest known Ancient Egyptian obelisk.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

Contrary to what its name suggests, you won't find any bunnies here.