The Church of Cristo Obrero in Atlántida, Uruguay, designed by engineer Eladio Dieste, is a masterpiece of modern architecture. Its unique undulating brick walls and wave-like roof demonstrate innovative construction techniques. The church is renowned for its minimalistic yet deeply spiritual design, blending organic forms with structural integrity, making it a landmark of 20th-century architecture.

The Petra-Tophana cave city in Armenia is a hidden gem, carved directly into the rugged cliffs of the Armenian highlands. Dating back to the early medieval period, this site showcases the ingenuity of ancient Armenian builders, who created a network of rock-cut chambers and passageways. The caves served both religious and residential purposes, offering a glimpse into a bygone era of history and spirituality.

The Alcázar in Segovia is an impressive medieval castle built on the site of a former Moorish fortress. Erected in the 12th century, it served as a residence for the Castilian monarchs and became a symbol of their power. The castle is renowned for its sharp towers and rich architectural heritage, which has been preserved to this day.

One of the most famous aqueducts in France is Pont du Gard, located near the city of Nîmes. This ancient Roman aqueduct, built in the 1st century AD, is one of the most impressive and well-preserved structures of its kind.

Pont du Gard is a three-tiered aqueduct that spans the Gardon River and was part of a water supply system that delivered water to the Roman city of Nemausus (modern-day Nîmes). The highest section of the aqueduct reaches 49 meters, making it the tallest of all known Roman aqueducts.

Big Ben is a clock tower in London, built in 1859. Initially, "Big Ben" referred only to the massive bell inside the tower, but over time, it became the name for the entire structure. Today, it is one of the most iconic symbols of London and the United Kingdom.

Tower Bridge, built in Victorian Gothic style and opened in 1894, combines both suspension and bascule designs. Its two massive towers are an integral part of London’s skyline. The bridge is unique because its central span can be raised to allow large ships to pass through. Tower Bridge is also one of the city's major tourist attractions.