This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

Former villa and estate of James Deering developed to preserve native tropical forests.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

A luxuriant botanical garden below sea level.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

Miniature art that tells an enormous story.

The world's largest military aircraft cemetery.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

The most loyal of little dogs, or a Victorian era publicity stunt?

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

The ancient tomb acts as a calendar that keeps perfect time.

A gigantic 10-foot tall stone man.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.