The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

Famously misunderstood wonder of the ancient world

The accidental discovery of this gilt bronze head led archaeologists to find the Roman Baths in the city of Bath

A somber statue commemorating a Danish merfolk-tale.

The shiny silver little brother to Copenhagen's Little Mermaid statue.

Old Danish castle immortalized in Shakespeare's Hamlet.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Celebrating the man behind the Mangrove, a restaurant that became a crucial hub for Black activism in London.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

This boat represents the promise of undiscovered territory, a dream of hope, and progress and freedom for Iceland.

This five-foot-tall bronze bird is a memorial to a species that was hunted out of existence.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

This beautiful, historic church looks like something out of a simpler past.

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

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Texas’s first suspension bridge is still carrying people across the Brazos.