Cathedral carved out of salt, located a mile below the earth's surface.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

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

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

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

A hidden alley in urban Baltimore is a haven for graffiti artists.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

A museum dedicated to exhibiting remarkable outsider art.

The trials and tribulations of marking Poe's grave.