This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

A 142-foot-tall Q-tip on Bristol's skyline.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

In Costa Rica's cloud forest, the roots of a woody ficus create a botanical bridge.

Balanced rock sculptures pay tribute to a murdered conservationist and his pioneer wife.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Israel's premiere solar energy research facility provides energy to nomads.

On this wooded path, a stained-glass window creates a spellbinding forest cathedral.

Constructed from recycled wrought iron railroad tracks, it's been described as the most beautiful seaside pier in England.

17th-century merchants in Bristol nailed their deals by placing money on these pedestals.

A historic, reportedly haunted pub that provided inspiration for several famous adventure novels.

After protestors toppled a statue of a 17th-century slave trader, the pedestal where it once stood remains unoccupied.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Three columns of volcanic rock shoot out of the ocean.

The unusual clock on this 18th-century market building has an extra minute hand for "Bristol time."

Ecuador’s historic seat of government has been quietly looted in recent decades, and no one knows how or by whom.

Building this tragically pointless stone barrier cost the lives of the prisoners made to build it.

Quito's historic, main square dates back to the 16th century.

Legend says if this neo-Gothic basilica is ever officially completed, the world will come to an end.

It took 160 years to complete the most ornate church in Ecuador.