A massive sustainable farm designed by the mastermind behind Central Park.

A beautiful geyser under environmental threat.

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

5,000 skulls in memorial to those killed by the Khmer Rouge.

A battle between nature and architecture in the Cambodian jungle.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

The Hudson River School comes alive at this palatial estate.

The only intersection in America where the buildings on all four corners were built pre-Revolutionary War.

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

Why have you never heard of the second most popular tourist site in New York?

100 massive sculptures in the Hudson River Valley.

The oldest continuously inhabited street in America.

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

New York's oldest and possibly grandest keeper of books.

A once grand hotel is being retaken by the wilderness it once capitalized on.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Elevated freight railway turned wildly successful urban park.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Macabre astrological automaton clock dating to the late 1400s.

Pompeii's less famous neighbor is still revealing her secrets.

A church of bones, decorated with 40,000 human skeletons.

This black church sits alone among a field of lava rock.