maxa: it's a time-honored tradition that after a hard day at the old grindstone, workingmen kick back with a pint at the local pub. i'm getting a lesson in the fine art of dart throwing, a great irish pastime. maxa: ok. don't keep your wrist straight. don't push it. ok. maxa, voice-over: and you know what? it isn't as easy as it looks. man: you're kind of holding them, you know? uh-huh. i'm clearly not spending enough time in pubs. second man: i can take both sides with one dart. ha ha ha! maxa: the strange, lunarlike landscape south of galway in county clare may be western ireland's most remarkable site. this is called the burren, which is irish for "rocky country," and it stretches about a hundred square miles. a great way to see the burren up close is to rent a bicycle in the town of ballyvaughn. 300 million years ago, this was the bottom of a tropical sea, where layers of coral and shells collected. eventually, massive rumblings of the earth's crust forced the land above sea level. back in prehistoric times, about 5,000 years ago, people settled here, cleared the land, and grazed