The only remaining historic maritime signal station in the United States.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

This elaborate towering structure was once famed for its revolutionary height.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Dr Barnes' $25 billion private collection of art and arboretum.

Yo, Adrian!

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The world’s first penitentiary, meant to be humane, drove men insane.

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

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

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

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

The site of the climactic scene from the classic horror film is now a historic landmark.

A whimsical bridge adorned with decorative dragons.

Amsterdam's former hotspot for public executions and dissections.

Visiting this café is like visiting the Austrian grandma you wish you had.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

One of the best collections of wax anatomical models in the world.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

This former insane asylum now holds a pathological anatomy museum.

The final resting place for the remains of 143 Habsburg royalty.

The beautiful baroque library of the Hapsburg empire.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.