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

Hear the quietest sound from across the dome.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The record holder for the world’s largest peach.

Walk the whole Mississippi River!

Medicinal spa created with the discharge from a geothermal energy plant.

The site of Paul Revere's historic two lantern warning.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This simple home was the beginning of a long journey for the iconic Western film star.

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

Exact replica of the ancient monument, but much, much lighter.

A former major munitions plant that has been converted into a sprawling art space.

At 207 feet, one of the world's longest continuous escalators.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

Largest Roman Catholic church in North America.

The site of the climactic scene from the classic horror film is now a historic landmark.

Home to items never before seen by the public.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.