The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

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

A portal into the bricked up canal that runs through the heart of Washington D.C.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

Obscure Freemasons still live in D.C.’s largest private residence.

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

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

Known as the "Stairway to Heaven," this historic canal dates back to the 1700s.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

The medieval prince founded the first library in Ukraine at Saint Sophia's Cathedral where he was interred.

Last remaining nuclear missile base in Ukraine.

A tribute to a Ukrainian heroine who went undercover and killed several Nazi operatives.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

340-foot statue built to honour the Heroes of the Soviet Union.

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

The deepest metro station in the world.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

When you've got to go, you've got to go.

An Art Nouveau building covered in animal gargoyles and grotesques.