The largest stone circle in the world has ended up bringing up more questions than it has answered.

England's only square-dimension hill horse was built to celebrate Queen Victoria's coronation.

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

Now isolated, this church was once the center of a bustling village that succumbed to the Black Death.

England's most notorious suicide spot.

An avant-garde artist is survived by his seaside garden.

Built by a king and rebuilt by an emperor, this aqueduct transported water for 1,200 years to this ancient Mediterranean hub.

Tiny memorials honor individual victims of the Holocaust.

In this truly magical place, rent hasn't been raised since the year 1520.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The fairy tale castle of the "fairy-tale king."

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

This abandoned Belgian fortress is purposefully being left to nature.

Nicolas Schöffer's massive interactive sculpture was assembled in 1961 and brought back online in 2016.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

This giant urban staircase was built to keep the city's brave fighting men from getting waylaid in the red light district.

This full-sized orange tree lives suspended in mid-air above the streets of Jaffa.

A "miracle" that seems to produce more holy fistfights than holy revelations.

The only quarter of the Old City not dedicated to a major world religion.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.