These mysterious petroglyphs in Vermont reflect a troubled history in the treatment of Native American culture.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

An exquisite tunnel of cascading flowers.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

The ruins of a bombed medieval village memorialize the destruction of the Spanish Civil War.

A small pack of an ancient, hairless breed of dog once believed to guide souls through the underworld lives on its grounds.

This stunning limestone waterfall is the highest in Estonia.

Radical Bookstore and Community Space.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

The winter home of millions of migrating monarch butterflies.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.