The oldest bookstore in Iceland.

This elderly couple's hand-picked collection of rare gems is one of the finest in all of Iceland.

This aromatherapy shop and mini-museum cofounded by the Sigur Rós frontman documents Icelandic history through scents.

This canyon is comprised of gorgeous waters and magnificent basalt columns.

Largest private bird collection in Iceland, formed from a tragic accident.

These enlarged egg sculptures represent the native birds of eastern Iceland.

Over the last century, this elegant columned facade has been home to the headquarters of a bank, several nightclubs, and a restaurant.

An 18th-century townhouse that once hosted guests of the president.

This house was once the location of Frelinghuysen University.

Dedicated to the man who created the first radio wave communication system.

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

One of the last mosaic tile facades found in the city.

The legacy of a wealthy executive and his wife, this little-known art museum features works by Picasso, Monet, Renoir, Cezanne, and more.

This historic building is now home to the Public Access Corporation for the District of Columbia.

A rare example of a rural school in Washington, D.C.

The Conduit Road Schoolhouse is one of the last one-room schoolhouses remaining in Washington, D.C.

The hippo that stands on this university campus was once a drunken flea market purchase.

The historic home of an educator, abolitionist, activist, and poet.

The last remaining building in Washington, D.C., built by H.H. Richardson, one of America's most iconic architects.

A street in front of NASA's D.C. headquarters has been named in honor of the Black women who were essential to early spaceflight.

The former home of Lillian Evans Tibbs and her grandson, Thurlow Evans Tibbs Jr., whose prodigious contributions to music and art spanned more than 90 years.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

Home to two notable early-20th-century Black educators, Lucy Slowe and Mary Burrill.

A brass and marble scale model of the solar system embedded in the concrete.