Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

A museum dedicated to exhibiting remarkable outsider art.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

The trials and tribulations of marking Poe's grave.

It was once the base for a series of domestic terror attacks.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Washington's iconic carousel has a nice piece of Civil Rights history.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A super-sized promotional trick that is now a D.C. landmark.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

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

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

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

This demon atop the Notre-Dame de Paris looks utterly bored.

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

The narrowest street in Paris.

Former hunting lodge of a duke who was an avid collector of impressionist works.

This bridge was constructed from the rubble of the infamous Bastille.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.