Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

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

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

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

Decades before the scandal, this staircase on the river was a literal "water gate."

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

The most decorated dog of World War I is preserved in the Smithsonian.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

A centuries-old church stands as a testament to Boston's "father of architecture."

Millions of numbers carved in glass represent the tattoos forced upon victims.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

This impressive Boston holy house is the American mecca for Christian scientists.

One of the indelible moments of the American Revolution took place at this location.

A former waterfront market is now in the center of town due to some interesting Boston engineering.