Order cookies baked by cloistered nuns in a 400-year-old monastery.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

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

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

Known locally as the Jungfrutornet, this Medieval tower hides a dark legend.

A catapult rock from Gotland’s 13th-century civil war is still lodged in Scandinavia's best-preserved medieval city wall.

Buried beneath an unassuming Gotland farm was the largest collection of Viking silver, mostly of Islamic origin.

Replica of an old Esso filling station, complete with Wayne gravity pump and outhouse.

The world's largest frame offers spectacular views of the city's past and present.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

Home of the unusual art of water puppetry, one of Vietnam's oldest curiosities.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

This dangerous-looking suspension bridge may have been too unstable to remain open.

This statue of an eagle taking flight welcomes visitors to Langkawi.

Once the private home of China’s most legendary tycoon, getting inside this stunning mansion no longer requires an elite pedigree or acts of daring.

The lavish, well-preserved home of a wealthy Baba Nyonya family is now a cultural museum.