This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

This library and museum is dedicated to the life and literature of the Indianapolis native author.

The largest ancient burial mound in Ohio.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

The only building in Louisville (hopefully) that contains two ancient holy skeletons.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

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

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

This boulder stays on its mountain thanks to a huge chain and on the map due to local legend.

One street divides a single town that stands in two U.S. states.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.