The amazing thing about Machu Picchu is not just that it's a historical site, it's the way it appears surrounded by nature that is what makes it special.
Macchu Picchu is special not just because it's a famous historical site, but because of the way it blends in with the surrounding nature and scenery.
「ただの歴史的な遺産ではなく、自然との調和もすごい」= The amazing thing about Machu Picchu is not just that it's a historical site, it's the way it appears surrounded by nature that is what makes it special. / Macchu Picchu is special not just because it's a famous historical site, but because of the way it blends in with the surrounding nature and scenery.
ボキャブラリー
歴史的な = historical
遺産 = (historical) site
自然 = nature
調和 = harmony (例文ではblend inという言い方を使いました)
amazing thing = 凄い点・すばらしい点
surrounded = 囲まれている
special = 特別
scenery = 景色