Architecture

Steel expands when heated. During hot summer days, the iron lattice of the Eiffel Tower can expand enough to grow approximately 15 cm in height. In winter, the cold causes the metal to contract and the tower shrinks back down.

The Forbidden City in Beijing, built between 1406 and 1420, was the imperial palace of 24 Ming and Qing dynasty emperors. It contains approximately 8,728 rooms across 180 acres and is the world's largest palace complex. Forbidden to ordinary citizens for 500 years, it is now China's most-visited museum, drawing over 14 million visitors annually before the COVID-19 pandemic.

With 26 UNESCO World Heritage Sites as of 2024, Iran leads the entire Middle East in inscribed cultural and natural heritage. These include Persepolis, the ancient capital of the Achaemenid Empire; the Persian Gardens; and the historic city of Isfahan.

The Iranian city of Yazd is famous for its 'windcatchers' (badgir) — tall tower structures that capture prevailing winds and funnel cool air down into buildings below. This passive cooling system has been in use for over 3,000 years and requires no electricity, working entirely through natural airflow.

The UNESCO World Heritage site of Lalibela boasts eleven monolithic churches, intricately carved downwards out of single blocks of rock in the 12th and 13th centuries. These architectural marvels are still active places of worship today.

The Prague Astronomical Clock, or Orloj, is the world's third-oldest astronomical clock and the oldest one still in operation. Installed in 1410, it displays not only the time but also the position of the sun and moon, and various astronomical details.

Prague Castle isn't just a castle; it's a sprawling complex of palaces, churches, gardens, and defensive buildings. Recognized by the Guinness Book of Records, it spans over 70,000 square meters, showcasing over a thousand years of history.

This imperial palace complex, built in the 15th century, was designed with exactly 9,999 rooms, just shy of the mythical 10,000 rooms of the Heavenly Palace. This number symbolized the emperor's divine connection, as only heaven could possess a perfect 10,000 rooms.

Built in the 1700s, the Mission House in Bodden Town offers a glimpse into early Caymanian life. It served as a home, school, and church, reflecting the islands' colonial and religious heritage.

The historic district of Old Quebec is surrounded by fortified walls, a UNESCO World Heritage site, and the only remaining example of a fortified city in the Americas north of Mexico. Its ramparts offer stunning views and a glimpse into its colonial past.