The only pollutant in the clear blue water is sunscreen.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

A massive stairway that almost wasn't leads to one of Australia's most scenic vistas.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Fittingly, America's museum of architecture is itself a magnificently designed old building.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A wondrous old library overlooking the nation's capital.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Home to items never before seen by the public.