The United States Capitol's former columns still stand.

Largest Roman Catholic church in North America.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A museum dedicated to exhibiting remarkable outsider art.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The stoutest tree in the world.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

An astounding collection of medical specimens, including bits of President Lincoln.