The metal spire on the roof of this tower was intended as an airship docking station, but it was never actually used.

148 feet long and in the middle of a verdant forest.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

Once one of the largest producers of pig iron in the world.

You don't have to be an ambassador to dine like one.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Built in 1945, this historic train station has a new lease on life with its baggage area serving as an event space.

Hidden within an idyllic suburban garden is a memorial dedicated to the victims of a terrifying spree of killings committed on U.S. soil.

These five Art Deco homes were meant to solve the "small house problem."

This wildlife trust is dedicated to orphaned elephant rescue and conservation.

Drink and dine in a coral cave that's at least 120,000 years old.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

Because sometimes the most efficient route from A to B isn't a straight line.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

A medieval military street hidden beneath a charming French fishing village.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

The construction of a tram line unveiled hidden remnants of the old medieval city.

Learn about the history and craftsmanship of carousels inside this museum located in a former post office.

The largest earthwork effigy in the world.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.