A collection of outdoor mystical statues paying homage to indigenous Australians and ecological stewardship.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A Roman spa buried deep beneath the City of London.

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

This one has sailed five times as far as Sir Francis Drake's famous ship.

This luxury shopping lane has been protected by its own tiny police force for over a century.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

An abandoned tank sits in an empty London lot as a symbolic middle finger to local city planners.

Charles Babbage's proto-computer, painstakingly brought to life.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

The monster at the center of the Darwin Center Spirit Collection.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A naturally mummified 2,000-year-old man.

This stoic bronze soldier stands as a symbol of Russian sacrifice or Soviet oppression, or maybe both.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

A forest park outside Tallinn full of architectural and artistic curiosities.

The Guardian of Tallinn.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.