A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.

These lush botanical gardens employ the most purrfect pest control force.

A monument commemorating the role of Alaska's native Tlingit guides in the Klondike Gold Rush.

A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

A clone of a cloned tree that was so important it allegedly had its own guards.

An Industrial Revolution-era public work that purified water using nothing but sand.

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

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

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

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

The land is home to swimming ponies and a legendary 18th-century treasure.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

Constructed from recycled wrought iron railroad tracks, it's been described as the most beautiful seaside pier in England.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.