A former Army airfield is home to one of the largest aviation museums in America.

Built around 1723, this is the oldest surviving home in the U.S.'s oldest colonial city.

This World War II-era bunker hides between medieval chapels in Nijmegen's city center.

One of the largest numismatic collections in Europe fell victim to a huge theft.

Long before Europeans arrived, Native Americans built an artificial island out of shells that has withstood a millennia of hurricanes.

At this rural museum, visitors can experience "Boomtown U.S.A.," a lifelike re-creation of an oil boomtown in the 1930s.

In this Romani neighborhood lies a museum dedicated to the culture and history of the Roma.

France's high-tech, future-themed amusement park.

The arch marks the beginning of the road for northbound travelers.

The largest single-building tribal cultural center in the U.S. is an expansive museum in Oklahoma City.

With a design inspired by traditional Latvian textiles, this monument honors the Latvian people who suffered under Soviet occupation.

The world's only surviving heavy cruiser has a haunting history.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

A highly-criticized monument in Budapest has become the site of a makeshift Holocaust memorial.

A network of ancient tunnels and vaulted chambers with mystical Buddhist reliefs, built for ascetic training.

Cold storage for agricultural biodiversity.

The world's northernmost botanic garden has 25 collections of plants from arctic and alpine regions.

The ruins of a world-renowned medieval hospital.

This impressive chasm is one of the longest natural underground cavities in the world.

Explore the cabin where the famed abolitionist once lived and the site where he fought the Battle of Osawatomie.

The ruins of a medieval citadel believed to be haunted by a ministry of wish-granting djinns.

Chronicling the history of Thailand’s unique currencies, from the silver “bullet money” to porcelain gambling tokens of various shapes.

The ruins of what is considered the world's oldest university.

This public observatory is home to the "celestial cannon," the longest pointable telescope in the world.