Huge masonic hall in Philadelphia with lavishly themed rooms.

The first American department store, and home to the largest operating musical instrument in the world.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

Step into Monet's world at this fine-dining restaurant in the middle of a New Jersey sculpture park.

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

Yo, Adrian!

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

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

Alexander Hamilton’s creation caused quite a bit of controversy.

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

Ripped apart by a bomb in 1993, the shell of Pablo Escobar's infamous vacation house still stands.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

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

This downtown Dallas art installation is always on the lookout.

This last stalwart of the now-forgotten feminist restaurant movement served food in an activist atmosphere since 1977.

Forgotten under the construction of a new urban roadway is a small, abandoned part of town.

Mansion and shopping center used in the 1975 film "The Stepford Wives."

Remarkably realistic Florida shoal bass "swim" inside this large globoid sculpture.

A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

The "possessed" house that inspired "The Haunting in Connecticut" book and movie.

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

This petite park lets visitors see and touch examples of fossilized dinosaur tracks.