Holding the most bodies of any cemetery in the United States.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

A bit of retro transportation flair preserved in the world's largest department store.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

Tucked in the back of this amazing antique store is an important piece of medical history.

A "miracle" that seems to produce more holy fistfights than holy revelations.

The only quarter of the Old City not dedicated to a major world religion.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Elaborate patterns adorn the city's disappearing traditional architecture.

Yemen's "Stone Palace" looks like it was carved right out of the tall stone column on which it is built.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

This abandoned five-star hotel is now a five-star urban exploration destination.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

The platform atop this verdant volcano was built with the help of a royal elephant.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

This cemetery features modernist statues as strange as its name.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.