This tremendous timepiece was once the largest cuckoo clock in the world.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

This might just be the TARDIS of bookstores.

A daily replay of the experiment that proved the rotation of the Earth.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

The oldest surviving botanic garden in the United States.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

The final resting place of soldiers' loyal canine companions.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

360° views of the city plus five floors of optical illusions and hands-on science.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

This heritage rail line meanders through Delaware’s Red Clay Valley.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

The longest covered bridge in Delaware.

These ruins of an octagonal stone school that was later used as an A.U.M.P. church exemplify a popular school design from the 1830s.

The abandoned coal loading dock is a canvas for unsanctioned art.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."