John Cowan said he "stepped over" the edge of an 18th century feature called a "ha-ha" in the pitch black as they returned to Hopetoun House car park.

BBC: Hopetoun House

As for Google, they made something that gave users an 'ah-ha' experience.

FORBES: Magazine Article

The Jerusalem daily Ha'aretz quoted senior Israeli officials as saying they know who killed Zeevi and who sent the killers.

CNN: Fatah man killed in car explosion

And those visiting the nearby Mayan-themed nature parks Xcaret and Xel-Ha face similar rules, lest travellers leave behind an oily trail when they snorkel or swim with dolphins.

BBC: Travellers�� impact on coral reefs