Originally built upon Roman fortifications on a rocky promontory in the 900s by the Counts of Luxembourg, the Luxembourg Fortress gained strategic importance located between the French Kingdom and the Hapsburg Empire. By the 1600s it became so impregnable it was called the “Gibraltar of the North.”

It was fought over by so many armies that finally, in establishing the Grand Duchy of Luxembourg’s full independence and neutrality in 1867, Luxembourgers agreed to tear it down.

What you see here is what is left, and is now a World Heritage Site. The Chemin de la Corniche ­– the promenade along the top of the ramparts overlooking Alzette River and the Old City – is renowned as “Europe’s most beautiful balcony.”

Wedged between France, Belgium, and Germany, small 1,000 square-mile Luxembourg is a haven of peaceful beauty. Come here to stand on these ramparts to experience it yourself. (Glimpses of Our Breathtaking World #233 photo ©Jack Wheeler)

Galapagos Islands – November 2015. In the waters here, enormous schools of striped mullet swim together in one huge swirling ball by the tens of thousands.

One of the more astounding experiences a scuba diver can have is to swim far below one of these rotating living balls, then slowly rise straight up into it. The fish do not scatter, but merely create an empty column or vertical tunnel for you – so you float inside the ball with countless thousands of calm unperturbed fish circling around you and your dive buddy (who took this picture of me).

I’ve had the good fortune to go diving all over the world for the past sixty -plus years, and this experience is surely one of the most memorable of all. (Glimpses of Our Breathtaking World #140 Photo ©Jack Wheeler)

The Antarctic island of South Georgia is one of the most extraordinary places on earth. Square miles of king penguin rookeries, thousands of fur seals, hundreds of gigantic elephant seals amidst a backdrop of massive glaciers and snow-capped mountains.

All of the animals here have no fear of you whatever and ignore your presence – except if you make the mistake of getting too close to a bull elephant seal for his comfort. It’s a mistake I made as you can see. Luckily, with several tons of blubber to carry, this fellow can’t move as fast as me, so I hightailed it quickly. That satisfied him, and all was soon back to placidly normal again. (Glimpses of Our Breathtaking World #62 photo ©Jack Wheeler)

This is Temple IV at the ancient Mayan capital of Tikal, now in northern Guatemala. It was from the top of Temple IV that the shot in the original 1977 Star Wars movie was filmed of the Millennium Falcon landing (at 44 seconds) near jungle temples (Temples II and III) at the Rebel Base on the moon of Yavin 4.

Built in 740 AD, at 230 feet it is the tallest pre-Columbian structure in all the Americas. While Tikal’s earliest buildings date to the 4^th century BC, it was from 300 to 800 AD that Tikal flourished as one of the Mayan Empires most powerful kingdoms.

Then decline set in, with drought, deforestation, overpopulation, and constant warfare with rival kingdoms. With Tikal abandoned by the end of the 900s, it remained covered by rainforest jungle for over a thousand years. American archaeologists began excavations in the 1950s. Today with its major temples restored, Tikal is the most impressive example you can visit of Mayan civilization. (Glimpses of Our Breathtaking World #118 Photo ©Jack Wheeler)

August, 1983. It was pitch-black dark as I and a couple dozen heavily-armed UNITA guerrillas were rumbling over the roadless Angolan bush in a huge captured Russian truck. Suddenly there was an entire pride of lions running in front of the truck’s headlights. As they scattered, without warning a massive black-maned male jumped in front of us. The driver didn’t have time to swerve – we crashed into him full on, killing him instantly.

The UNITA fellows had me pose with him the next morning – obviously with no rifle as I was not hunting. It was to memorialize a tragic ending to a magnificent animal. (Glimpses of Our Breathtaking World #125 Photo ©Jack Wheeler)

One of the most dramatic sights along the Antrim Coast of Northern Ireland is the Carrick-a-Rede Rope Bridge. Originally built in the 1660s by salmon fishermen to get to their nets on the tiny islet of Carrick, it spans 70 feet across and 100 feet above the ocean waters surging below. It’s still used by the fishermen to this day. And while it’s been sturdily reinforced since it was a simple rope bridge, it’s still an invigorating experience to negotiate – especially in the wind and rain when I was there. Don’t pass it up if you’re ever in Northern Ireland. (Glimpses of Our Breathtaking World #232 photo ©Jack Wheeler)