This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This New Orleans statue of a portly figure in a goofy hat pays homage to a classic of satirical literature.

This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

A miniature city, once ruled by the Queen of the Netherlands.

This "social palace" housing complex created a relatively stable and self-contained worker's society... for a time.

These mammoth-yet-narrow crevasses in the Earth are perfect for taking an otherworldly swim.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

A gorgeous medieval library where the books are kept in chains.

This 16th-century monastery has been turned into a surrealist architecture compound.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

Dr Barnes' $25 billion private collection of art and arboretum.

The largest whale museum in Europe allows visitors to walk among life-size giants.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

On Japan's Tashirojima Island, cats are king.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

This historic New Orleans cemetery is the final resting place of members of the Independent Order of Odd Fellows.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

A magical place that lets you play in and explore the world of Studio Ghibli.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Legend says these rocks used to be hunting dogs, a story that may have inspired Sherlock Holmes' most famous case.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.