Visit a haunted Mughal mosque and the tomb of a Sufi saint and his disciple.

Art deco landmark on the outskirts of Washington, D.C.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

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

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

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

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

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

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

The first memorial dedicated solely to the Black troops who fought for the Union.

Also known as the Founding Church of Scientology.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

The final residence of an educator, civil rights leader, and presidential advisor was also the first headquarters of the National Council of Negro Women.

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

The former home of elite checkers battles of the Capital Pool Checkers Club.

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

The oldest continuously operating fish market in the United States.

The national park was once a plantation estate.

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.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.