This unusual geoglyph was built as a warning so low-flying aircraft wouldn't scare the zoo animals.

The ruins of Scottish sea salt production.

This grand old 80-foot sequoia towers above the buildings in the city’s retail center.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

This unique Seattle structure was designed to be the greenest commercial building on the planet.

The large rock formation where the Shawnee prophet Tenskwatawa stood and encouraged his warriors during the Battle of Tippecanoe.

Keep a lookout for replicas of this wooden soldier hiding in plain sight all around town.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

A rare permanent monument to the Scottish Travellers.

Stand at the center of this lakefront sundial, and you'll become part of the timepiece.

See the rare bloom of the "Queen of the Night" cactus at one of the world's largest succulent collections.

Two pillars set 10 paces apart commemorate the "last notable American duel."

CERN's beautiful, bending sculpture is a tribute to the spread of knowledge.

This Bronze Age boat was found buried remarkably intact in an English gravel pit.

Follow the original medieval paths that wind through this intriguing section of the city.

The world's first hotel built in an abandoned water-filled quarry.

At high tide this strange footbridge appears to have no purpose whatsoever.

The world's only bushplane museum captures the spirit of the early planes and pilots and their contributions to northern life in Canada.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

Dubbed the "Blade Runner dragon," this buzzing neon sign is a beloved local icon.

The longest stone bridge in England has an impressive history that dates back over 700 years.

Mysterious ancient petroglyphs carved on a glacial boulder at the tip of Bainbridge Island.

A sign marks the plane crash that caused two nuclear bombs to fall in North Carolina.