In which a local geological marvel becomes a quaint roadside attraction.

A "house to which to flee" for settlers in colonial Pennsylvania.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

This Great Depression-era creation was once known as the strangest house in the world.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

This historic lighthouse was well known for the large number of women who served as its keeper.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

This beloved marketplace mascot poops money and grants good luck.

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

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

The oldest surviving botanic garden in the United States.

America's first serial killer rests in anonymity.

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.

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

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

A total of 14 men held the title of "president" before George Washington—their historical legacies are enshrined in the lobby of a hotel.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

An occult-y, historic hotel with the World's Largest Ouija board on the roof.

A soon-to-be-forgotten roadside spectacle loaded with local lore.

A failed piece of Orientalism has become the proud symbol of a community.

A diorama of the Civil War, fought by cats.