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0:00:11 > 0:00:15- This is the Hafod estate - in Ceredigion.- - http://www.hafod.org/homepage.html
0:00:15 > 0:00:19- Two centuries ago, the owner, - Thomas Johnes, wanted to create...- - http://www.hafod.org/homepage.html
0:00:19 > 0:00:22- ..one of the most famous estates - in Britain...
0:00:22 > 0:00:27- ..according to the fashion - of the time, the picturesque.
0:00:28 > 0:00:30- According to the picturesque...
0:00:31 > 0:00:34- ..nature wasn't quite - good enough on its own.
0:00:35 > 0:00:37- It needed to be changed and tweaked.
0:00:37 > 0:00:42- At Hafod, Johnes moved rivers, - raised hills...
0:00:43 > 0:00:46- ..and planted three million trees...
0:00:46 > 0:00:49- ..to create a series of images - in the landscape.
0:00:49 > 0:00:52- People flocked - to see the artificial views.
0:00:52 > 0:00:57- The paths, waterfalls - and forests created by Johnes.
0:00:57 > 0:01:02- He even rearranged nature - to play tricks on his audience.
0:01:15 > 0:01:20- This is Johnes' joke and - it's a very effective visual joke.
0:01:20 > 0:01:23- If you stand - on this side of the bridge...
0:01:23 > 0:01:27- ..you see the Peiran river, - hence the name Pwllpeiran bridge.
0:01:28 > 0:01:32- You can see the river - flow down the valley. It's lovely.
0:01:34 > 0:01:39- If you cross the bridge to the other - side, you see something strange.
0:01:42 > 0:01:45- The river has disappeared.
0:01:48 > 0:01:49- This is the punchline.
0:01:51 > 0:01:54- The riverbed is totally dry.
0:01:54 > 0:01:56- How did that happen?
0:01:56 > 0:01:59- We have to go under the bridge - to find out.
0:02:11 > 0:02:13- This is the explanation.
0:02:13 > 0:02:17- To create the illusion - of a disappearing river...
0:02:17 > 0:02:20- ..Johnes used a lot of dynamite...
0:02:20 > 0:02:24- ..to make a tunnel for the water - to travel down the valley.
0:02:35 > 0:02:38- It reappears down there.
0:02:43 > 0:02:45- It's incredible - when you think about it.
0:02:46 > 0:02:50- It's taken a huge effort - to create this effect...
0:02:51 > 0:02:54- ..that almost nobody would notice.
0:02:59 > 0:03:01- S4C Subtitles by Testun Cyf.
0:03:02 > 0:03:02- .