During the holidays, a vintage subway train whisks New Yorkers back in time.

A remarkable two-country morph, this town is part of Germany legally but is by all other measures Swiss.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

The great Danube river starts here.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

An eerily charming collection of salvaged buildings and curios grown out of a family scrap business.

The remains of a British railway rusting in the jungle mist of a Brazilian mountainside.

Mexico's first public cable car soars over the congested streets outside Mexico City.

The world's largest and most outstanding marl lake regularly changes color.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

With over 340,000 artifacts and counting, there is something for everyone, often called the "Smithsonian of the West."

The most accurate timepiece in the world.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Formerly secret, precariously perched boulders.

This unique bridge physically lifts a piece of the road into the air to let boats pass by.

Walk through Czech history in Prague's largest graveyard.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A floating cat sanctuary on an Amsterdam canal.

This mummified mermaid corpse is an aquatic curio that was eventually revealed to be a fake.