Oakland's beautiful monumental cemetery.

A Berkeley sidewalk etched with 128 cast-iron poems.

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

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

One of Philadelphia's largest murals resides hidden under this bridge.

A 19th century bank turned into a 6-story immersive art experience.

Where some of America's earliest LGBTQ rights protests marched each Fourth of July

This overlooked courtyard and museum celebrate Benjamin Franklin's life and achievements.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Step into a pastel time capsule where candy is truly dandy.

Mural made of 100,000 pieces of hand blown glass, and one of the largest glass murals in the US.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

A 19th-century California philanthropist is entombed beneath the telescope he funded.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

This little valley along Highway 1 is engulfed by thousands of lilies during the spring season.

A playground built by the kids that is a child's wonderland, and a helicopter parent's nightmare.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

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

A historic covered bridge is but one example of an oddly prevalent American urban legend.

An allegedly cursed tree represents a town's reckoning with a racist past.