A geological oddity topped with a 2,000-year-old pagan temple.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

The building is a gigantic piece of art inspired by the shape of a desert rose.

The current seat of the Parliament of Andalusia was once the epicenter of the Great Plague of Seville.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

It houses the remains of a 17th-century version of the Titanic.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

This church is named for one of the most dramatic tales in the early Christian church.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

This wildlife trust is dedicated to orphaned elephant rescue and conservation.

There is only one place in the world where the corners of four nations come together.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

The loneliest plant in the world resides at the Durban Botanic Gardens...mostly.