The "floating factory" was a highlight in the career of the Italian architect known for his unusual use of reinforced concrete.

Legend has it these two stones are petrified trolls.

An annual goat race takes place within the walls of this medieval castle.

The last working ship mill in Italy, once widespread on major rivers in whole Europe

An architectural oddity where the triglyphs of the courtyard of walls create an optical illusion.

A small villa said to have inspired the design of the court jester at the heart of Giuseppe Verdi's 1851 opera.

After Sierra Leone's railways shut down in 1974, a collection of engines and other artifacts spent decades hidden away in this old workshop—now a museum.

Inside the small garden of two mid-century apartment buildings stands a centuries-old bell tower, separated from its original church and hidden from view.

A hidden bas-relief of a hare on a church main portal that brings good luck to the ones who find it.

Nearly 800 years old, this river lock is now a public park with a former fortified island.

In a tower at this centuries-old castle, members of a noble family were imprisoned and left to starve.

Once the hunting reserve of a noble family, this is one of the few remnants of Pleistocene planitial forest in northern Italy that still stands.

This decoration above a door, an unofficial family crest, is said to come alive during the night to try to get free of the stone.

A medieval tower with a suspended iron cage used as an open-air jail for criminals who were exposed as a warning.

The oldest of its kind in the country, this tree sits where formerly enslaved people are said to have founded the city of Freetown.

The seat of the Mantua bishop holds many secrets within its walls.

The foundation of this ancient stupa dates back to the 1st-century.

A floating bridge leaning on barges allows pedestrians to reach the historical center.

In Lago Superiore, the largest expanse of lotus flowers outside of Asia is hard to miss.

One of the most important Krio heritage sites in the country.

This museum is dedicated to one of Russia's greatest explorers.

The remains of the last Gonzaga villa, a luxurious palace built in spite of an economic crisis.

These oldest of these "embroidered stones" were carved 4,000 years ago in a high mountain valley.

A rehabilitation center for confiscated, orphaned, and abandoned chimpanzees.