This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

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

A crumbling hospital from the 1850s on Roosevelt Island.

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

This Roman amphitheater is said to be King Arthur's legendary Round Table.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

At the United Kingdom's only residential library you can sleep among the books.

The stately remains of Llywelyn the Great's mighty fortress.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

This poignant tribute to the White Rose movement showcases artifacts related to the heroic anti-Nazi struggle.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

You must take the A train... to the last active cemetery in Manhattan.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

New York's oldest and possibly grandest keeper of books.

A floating cat sanctuary on an Amsterdam canal.