Genoa's collection of over 4 million zoological, botanical, and geological specimens from around the world.

This cemetery features modernist statues as strange as its name.

The world's oldest bookshop still in operation.

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

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

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

This unreal Portuguese palace looks as though it's made from a pile of different castles.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

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

A church of bones, decorated with 40,000 human skeletons.

An enormous and lavish Gothic church in Czechia.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Cave shrine on Monte Pellegrino.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

A unique seaside cave where Aleister Crowley faked his own death.