A mysterious monument where a woman who records say never existed was burnt alive for being a witch.

A Christian retreat founded to welcome refugees fleeing from the Nazis during World War II.

The sign at the garden gate reads: "These Plants Can Kill."

Mysterious 500-year-old tapestries depict a unicorn hunt.

The hollow trunk of this 650-year-old tree was used as a hideout by two Jewish brothers during World War II.

The world's oldest rose is so tough it survived being bombed in World War II.

One of the world's oldest trees comes with a Welsh legend intertwining it with a spirit prophesying death.

Possibly the oldest living thing in Europe, more likely a pagan survivor.

The world's oldest individual clonal tree looks like a wimp despite standing tall for 9,550 years.

A once-luxurious, now abandoned hotel in the Italian Alps.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

A Japanese train station built around a 700-year-old camphor tree.

Underground vaults of a former brewery beneath Brooklyn's Crown Heights are now used to ripen cheese.

The library's graceful rotunda is like a bibliophile's temple.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Hamburgers are intensely proud of their tunnel beneath the river.

Its town washed away centuries ago, this lonely tower by the sea tells the tale of a mermaid and a curse.

A century-old network of freight tunnels underneath the city's historic business district.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

Along the Palisades skyline are the ruins of a large mansion built in 1911 and demolished in the 1930s.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.