Behind a row of ordinary D.C. houses hides a labyrinth of interconnected art galleries filled with unusual treasures and outsider art.

A grand old heritage arch stands near the entrance of a hospital.

Walk through a well-preserved World War II Nazi prison and transit camp.

A tiny historic cemetery located in the parking lot of a shopping complex.

William Shakespeare and other famous historical personalities watch over a square in the heart of Mumbai.

A somber place of memory and reflection, that tells the story of Riga's Jewish community before and during World War II.

This statue of a Parsi businessman and philanthropist is an iconic landmark in the city.

As the oldest natural history museum in the Americas, these halls contain everything from dinosaur bones to biological samples collected by Lewis and Clark.

The world's largest flat-topped mountain.

This slender 19th-century clock tower stands at the entrance of a famous garden and zoo.

A bare tree in Riga’s Esplanāde is transformed into an extraordinary vertical neighbourhood by scores of colourful bird nesting boxes clustered across its trunk and branches.

Amid miles of wooded trails lies the story of one of America’s earliest free Black communities.

Some museums preserve beautiful things; this museum preserves hard work.

Yorktown’s grandest colonial home still wears the scars of the siege that helped end the American Revolution.

This three-story Victorian mansion is now home to the National Park Service’s Historic Preservation Training Center headquarters.

As the oldest structure in Harris County, this 200-year-old frontier cabin stands in the literal shadow of downtown Houston’s massive skyscrapers.

An elegant German-style resort overlooking the Potomoc River.

This museum holds the most comprehensive collection of Armenian art in the world.

The trials and tribulations of marking Poe’s grave.

The hauntingly beautiful interior of a church almost destroyed by protestors’ fire.

National Mall monument to the inventor of the screw propeller.

A time capsule of life in Southern Florida in the 1930s.

A stone nook where Frederick Douglass escaped the world to think, read, and write.

A merry-go-round that became a rallying point for the early Civil Rights Movement.