The Chateau du Rosey was built in the 14th century, and the school was founded in 1880. Le Rosey — All rights reserved. Switzerland's Institut Le Rosey is the most expensive school in the world.

Boasting two beautiful campuses in two locations — the spring/summer campus in the 14th-century Château du Rosey estate in Rolle, and, in the winter, chalets in the ski resort of Gstaad — it costs 108,900 Swiss francs (about £87,300) a year in tuition fees.

Institut Le Rosey's famous alumni reportedly include King Albert II of Belgium, the Shah of Iran, Prince Rainier of Monaco, and King Farouk of Egypt.

The school says 30% of its students join universities ranked in the top 25 in the world — including those in the Ivy League, MIT, and Oxbridge — after graduating.

So what's all the fuss about?

"Evidently, we are Switzerland's oldest international boarding school. We have a certain weight that goes through the name because of families that have been here before," Felipe Laurent, an alumnus and Le Rosey spokesman, told Business Insider. Both Laurent and his older sister graduated from Le Rosey — he spent five years at the school, while she studied for three.

"I think that some families are looking for that," he added, "in that they might have studied here and so they want their children to continue that sort of legacy."

We spoke to Laurent to find out what really goes on behind its doors — and were offered an exclusive look inside. Scroll to see inside the most expensive school in the world.

Note: The Instagram images below were published by accounts not managed by Le Rosey.