A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Famously misunderstood wonder of the ancient world

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Home to more than 13,000 pieces of war memorabilia and military equipment.

A remnant of Korea's colonial past lies forgotten in a hip neighborhood in Seoul.

About as hidden as can be, this specialty coffee shop is wedged between multi-story buildings at the end of a dark, skinny alleyway in Seoul.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Venture into the hideout of one of Hong Kong's legendary pirates.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.