A 32-acre fun park dedicated to all things cheese.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A giant Troll lurks under one of Seattle's oldest bridges.

Elevated freight railway turned wildly successful urban park.

A trash dump made beautiful by nature's power.

A sharp bend in a dramatic river canyon cut through red rocks.

Most-visited and most-photographed slot canyon in the American Southwest.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

Huge stone depressions which may have acted as an Incan agricultural experiment.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

A museum built around a bus-sized fossil on the side of the highway.

The colonial city's social history is reflected in its fanciful door knockers.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

The topiary maze at the Habsburg hunting lodge.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.