Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The fountain marks the area where hundreds of accused witches were burned at the stake.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

A scattered trail of street art adds a pop of color to the city's stark structures.

Civil War soldiers, captains of industry, and paupers all interred on historic grounds.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

A trio of colossal statues spread across a Dallas neighborhood chart the emergence of a giant robot born of a locomotive and spilled gin.

The multinational Burger King chain is banned from operating within 20 miles of a family restaurant filed under the same name.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Booker T. Washington's home at the Tuskegee Institute was a gem of splendor.

This artificial cave looks like something out of a fairytale.

Chicago's largest cemetery is full of beautiful Victorian monuments and more than a few ghost stories.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

Complex aquaponics systems allow fish and plants to grow in harmony.

An art deco ice cream shop covered in vintage train station tiles.

Less a museum than a bizarre fantasy world created by artists and engineers.

The only Bahá'í house of worship in North America and one of only a handful worldwide.