The trials and tribulations of marking Poe's grave.

Largest Roman Catholic church in North America.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

During this Shetland Islands celebration, hundreds of torch-carrying "guizers" lead a procession to burn a viking longboat.

This picturesque archeological site looks like it was pulled straight from a fantasy novel.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

A six-ton wedding present for the King of the Scots.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

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

A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

This massive redwood tree has a hole in the base big enough to drive through.

The simple log cabin of a famed loner and naturalist stands preserved as a symbol of the ultimate DIY lifestyle.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

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

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.