A unique rock formation that only a few have managed to venture inside.

Locals have a long-running relationship with the big-beaked birds of this Australian fishing town.

An unphotographable nightly march of tens of thousands of "fairy penguins" from sea to shore.

A clear example of the process of erosion in action.

A plaque at the lighthouse where Frederick Valentich made his last radio contact before he vanished without a trace.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

An American city stranded at the tip of a Canadian peninsula where strict adherence to the "49th parallel rule" became problematic.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

This amazingly preserved Doric temple was abandoned before it was ever completed.

142 ceramic steps become a mosaic once a year.

The world's most active stratovolcano is almost always erupting.

Contrary to what its name suggests, you won't find any bunnies here.

A monument to the migrants who cross the dangerous waters between North Africa and a tiny Italian island.

A beautiful oasis town dating back to the Roman period still serves as reprieve from the brutal summer sun in Libya.

Magnificent Roman ruins lie vulnerable to destruction on the edge of the Mediterranean.

A fortress-like granary that has been continually in use for more than nine centuries.

70 years of foreign military influence on the shores of Tripoli, Libya.

This triumphal arch is the only fully standing structure that remains from Roman-era Oea.

At this faithfully preserved medina off the Moroccan tourist circuit you can walk through six centuries of history in one day.

A small part of Russia that does not touch any other part of Russia.

These tiny cabins on a cableway have been carrying visitors at a Baltic resort down to the beach since 1912.