This room of wonder is full of relics, from knights in armor to rare works of art.

An oasis of beauty, tranquility and botanical research in the middle of Rome.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

A burial vault located under Tiber Island in the middle of the Italian capital.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

Gods clash with machines in a power plant regenerated as a museum.

This is the oldest Roman-made bridge in the city still existing in its original state.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

A huge enchanting public park just outside the ancient walls of Rome.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

One of the most important yet well-hidden museums dedicated to the history of medicine.

A fairy tale castle in modern Rome.

Jesus' footprints and the first catacombs in the world.

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

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The final resting place of the poets Shelley and Keats.

2300-year-old Roman road connecting the empire.

One of the deepest indoor swimming pools in the world.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

Housing the groundbreaking maps and globes of Gerard Mercator.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

Take a leisurely walk through the park to find the seven giant troll sculptures hidden throughout the park.

Most prolific publishing house in the 1600s open to the public.

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