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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

A fascinating insight into daily life in the Eastern Bloc.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

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

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

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Home to items never before seen by the public.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

100 massive sculptures in the Hudson River Valley.

Minimalist modern art on a repurposed military base in rural Texas.

The world's longest known cave system.

This private island is still in the family after a 400-year history including a witch hunt, a pirate, and multiple wars.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Elevated freight railway turned wildly successful urban park.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

Three hundred years of preserved Spanish colonial history in San Antonio.

Lie in a hammock where George Washington stood.

Cuba's historical trains remind natives of their country's sugary sweet past.