The privately owned cemetery that holds room for Washington's finest when they step down from life.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

Largest Roman Catholic church in North America.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

When it opened during the final years of the embargo, all the drinks and cigars were free.

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

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

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Home to items never before seen by the public.

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

The United States Capitol's former columns still stand.

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

It's believed that this small church was connected to the Hagia Sophia via a secret tunnel.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

A section of the long chain that blocked enemy ships from entering Constantinople.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

A fountain standing as a testament to a doomed alliance.

The most metal church of all time was built in record time because of an international, pious pissing contest.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.