The asteroid belt is nothing but tourist traps, and the rest stops really thin out after Saturn. Some of you will want to consider flying. Luckily, at a Boeing 777's maximum velocity of 590 miles per hour, the trip to Pluto will take only about 680 years.
Yet structures like the Pantheon and the Colosseum have survived for centuries, often with little to no maintenance. Geologists, archaeologists and engineers are studying the properties of ancient Roman concrete to solve the mystery of its longevity. âRoman concrete is . . . considerably weaker than modern concretes. Itâs approximately ten times weaker,â says Renato Perucchio, a mechanical engineer at the University of Rochester in New York.
From the Colosseum to the Forum, the glory of the height of the Roman Empire can still be felt. Yet, more recent landmarks draw an equal number of onlookers in a city filled with tourists. The Trevi Fountain, which was built in the 1700s, is perhaps one of Romeâs most iconic structures. Built on the site of an ancient Roman water source, it is made of the same material (travertine stone) as the Colosseum. It has appeared in films like Felliniâs La Dolce Vita.