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.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.

World's first "penitentiary," meant to be humane, drove men insane.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.