While exploring Roman archeological sites in Europe and the Middle East, I learned about geothermal energy. Centuries ago, the Romans saw the value of this natural resource and used it for their benefit. For example, the Roman Baths, about an hour and a half train ride from London, were constructed in the 1st century C.E to utilize the thermal water with a temperature of 46 degrees Celsius or 115 degrees Fahrenheit.

San Diego visitors can see history come alive at The US Grant Hotel. This magnificent property, designed by Harrison Albright, took five years to build. On October 15, 1910, the hotel opened with a final price tag of 1.9 million dollars. After a handful of renovations in the last century, the hotel still maintains its grandeur and commemorates its remarkable history by showcasing images and artifacts throughout the property.

Charlevoix, Quebec, is about an hour east of Quebec City. Four hundred million years ago, an asteroid that was estimated to be 4.5 kilometers (2 miles and 1,401 yards) in diameter hit that region. The enormous impact created a crater measuring 55 kilometers (33 miles and 975 yards) with a mountain in the center. Over time, Mother Nature has continued to sculpt the landscape. Wind, rain, snow, glaciers, and changes in temperature, as well as other natural elements, have made an impact on what locals call Charlevoix Astroblem.

Passengers aboard a New England to Canada cruise oftentimes visit Sydney, located on Cape Breton, an island that is part of Canada’s second-smallest province, Nova Scotia. Last fall, my Celebrity Cruises itinerary included an eight-hour stop in this port.

The birthplace of Zeus, the home of the Minotaur, Daedalus’ labyrinth (and Ariadne’s clue), the launching place of Icarus – where are you? Why, Crete, of course! The largest of all the Greek islands, Crete is one of the most beautiful – and historic – places in the world.

The city of San Antonio is celebrating 300 years since its founding by Spanish friars and Spanish settlers with historic events all year. That’s why the “Summer in Spain” initiative focuses specifically on the city’s artistic Spanish heritage.