In this quiet village, a blue plaque marks the spot where the famous fictional detective retired.

England's most notorious suicide spot.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

Eliza and Mary Chulkhurst were the first famous conjoined twins in England, but it's not clear when they were born.

Famously misunderstood wonder of the ancient world

This figure was cut into the hillside in 1937 to commemorate the coronation of King George VI.

This bridge later moonlighted as a local jail.

One of the largest megalithic complexes in England, which local legend holds is a wedding party turned to stone by the Devil.

The oldest residential street in Europe also features an optical illusion.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

Pablo Neruda's custom-built lover's nest was made to remind him of the sea and named after his mistress' hair.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

This colonial town in Colombia sits around the largest stone paved square in South America.

This small bridge serves as a symbol of South America's independence.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

This giant temperature attraction created some giant electric bills.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.