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In the final episode Piers and Caroline's journey starts on the Greek island of Anti Paros, to visit a nine-bedroom house that is hidden beneath the landscape and yet still achieves stunning sea views. As they discover, the green roof allows the underground spaces to be invisible so only the pool terrace and white-washed walls are on view.Their next stop takes them to the lush valleys of the Swiss Alps, where the owner architect made his four-bedroom house so invisible it has to be accessed via a tunnel from the traditional agricultural barn that was already on the site. Piers and Caroline emerge into the main house, its concave facade revealing panoramic views of the surrounding mountains.Next it's over to New Zealand's South Island, to a house that was built underground to soften the impact on the indigenous landscape while at the same time being heavily engineered to withstand the threat of earthquakes. Dynamite was used to excavate 5,000 cubic metres of earth and rock to create the three-bedroom main house and annex, constructed from concrete and cloaked with an engineered wing-shaped roof.Lastly, Caroline and Piers cycle to visit a very different underground house nestled in a nature reserve in the outskirts of Amsterdam, Holland. The four-bedroom family house was created by deep excavation and then by stacking the bedrooms and bathrooms across three floors on the north side, allowing for a huge light-filled open-plan living space facing south.

How to Watch The World's Most Extraordinary Homes Season 1 Episode 4 Legally and Safely

If you want to stream The World's Most Extraordinary Homes Season 1 Episode 4 through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry The World's Most Extraordinary Homes Season 1 Episode 4 films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.