This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

The corpse bride of Portugal.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

A garden in Lisbon filled with giant porcelain creatures.

This Tibetan monastery has survived multiple attacks and is also a sky burial site.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

A historic hill of tall tales, with one rather special tree.

The sculpture of the deceased cockatoo flops atop its personal plinth.

A quiet memorial to those who died saving others in the heart of the City of London.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

Hear the quietest sound from across the dome.

Banksy gives themself artistic license with this piece of London street art.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

The world's largest commercially available hamburger is complete with 15 pounds of lettuce, 30 pounds of bacon, and 36 pounds of cheese.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

In the middle of suburban Staten Island, a nearly 150-year-old bakery is preserving the art of a disappearing New York treat.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

This giant wooden treehouse within a sprawling garden has its own eatery.

Everything in this miniature world was handmade from matches, paperclips, wires, tin cans, and other everyday objects.

The colorful stairs are made with marble from the world's major quarries.