A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Oldest existing wire suspension bridge in the United States.

A decommissioned military complex that's now a modern industrial park.

A historic recreation of the golden age of the Erie Canal, abandoned for some time, slowly being restored.

This throwback amusement park is home to rides and unique storybook figures from the past.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

The fairy tale castle of the "fairy-tale king."

This vestige of Seychelles’s colonial past now resides in a busy intersection and didn’t chime for its first 96 years.

This record setting conveyor belt system can even be seen from space.

Morocco's Argania trees are infested with nut-hungry goats.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A bronze statue dating back as far as 1252, still has remnants of gold on its right cheek from ancient gilding.

The last remaining predreadnought battleship in the world has been a museum for nearly a century.

A building so large that it has its own weather.

An Industrial Revolution-era public work that purified water using nothing but sand.