Largest Roman Catholic church in North America.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

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

"The prettiest love letters in the world" ... or so said Lord Byron.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A unique sculpture park that specializes in the huge and bizarre.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Third time's a charm, or in this case, two testicles are.

A brutalist gem towering over the heart of Milan.

A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.

Giant topiary dog once played a role in a terrorist bomb plot.

At the birthplace of American railroading, a world-class collection of historic trains.

It’s not hard to see why the historic Peabody Conservatory of Music’s library has been described as a “cathedral of books.”

The site where Poe “in great distress, and ... in need of immediate assistance” likely died.

This Asian-inspired tower in a lush urban park provides spectacular panoramic views of Baltimore.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

A museum dedicated to exhibiting remarkable outsider art.

A charming tour of the umbrella, tin-can, and drinking-straw capital of the world.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.