A treasure trove of fine art is hiding inside this small medieval abbey in Gascony.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

The deserted pirate-themed restaurant still entices explorers.

There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

Perhaps the most beautiful of preserved saints, with a little help from Paris.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

Venice's "Island of the Mad."

An abandoned tuberculosis hospital said to be haunted by the patients who died within its walls.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

This charming candle shop has been in business since 1789.

The world's oldest bookshop still in operation.

This small chapel is built of human bones and decorated with a golden skeleton.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A small but charming botanical garden that contains many exotic plant species.

The stunning interior of this Gothic church is covered in ornate gold details.

A crucified and bearded female saint.

A saintly relic hidden in a Prague church basement.

This artificial cave looks like something out of a fairytale.

An eerie, existential museum dedicated to the author of "The Metamorphosis."