This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

A walkable map of the world, made from soil and stone by one man.

Six beautiful wooden giants are hidden around Copenhagen.

The rusting hulk of a hand-powered, nearly 160-year-old submarine abandoned in 1869 due to the ravages of decompression sickness.

A no-frills, DIY nature preserve manned by a U.S. expat who has dedicated his life to turtle conservation.

A huge, bustling local market in Panama City.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

This curious, round temple is the oldest still-standing marble building in Rome.

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

Ancient ruins hidden underneath a modern luxury hotel.

This large, circular tomb is the final resting place of the first emperor of Rome.

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

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

A Nesting Doll of Churches.

A fairy tale castle in modern Rome.

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

This museum is dedicated to the history and design of purses.

Ernest Hemingway wrote a good portion of "A Farewell to Arms" while living with the parents of his second wife, Pauline Pfeiffer.

A short boardwalk through a swamp leads to the spot from which the Louisiana Purchase was surveyed.

Where Elvis Presley received his first Army buzz cut.

Life-size figures portray depot attendants, train crew, and passengers frozen in time at the oldest railroad station in Arkansas.

This one-room schoolhouse in rural Arkansas dates to the 1920s, but looks like it could be the 1820s.