Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

Bubbling up from deep underground is the warm crystal clear water that fills the Warm Springs Pools, America's oldest spa.

Both the building and blades of this reconstructed 19th-century windmill can turn in a breeze.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

The land is home to swimming ponies and a legendary 18th-century treasure.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

Largest Roman Catholic church in North America.

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

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

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

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

A bit of retro transportation flair preserved in the world's largest department store.

This Buddhist temple is home to the graves of the Japanese national legends, the 47 Ronin.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A monument celebrating the idea of reaching inaccessible places.

The final home of the most famous horse of the American Civil War.

Enjoy dishes that founding fathers once ate at this Colonial Williamsburg pub.

These unusual rooms on wheels are holdovers from the 1960s.

Dine like an American revolutionary at Colonial Williamsburg.

The only recreation of William Shakespeare's indoor playhouse.

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